Add credits to used libraries, programs and files.

CREDITS

@@ -0,0 +1,60 @@
+FediPotato makes direct use of the following libraries and programs:
+
+  C** and the C++ standard library
+    From: The C++ committee and community, implemented by various projects.
+          https://isocpp.org/
+
+  mastodonpp
+    From: tastytea and community
+          https://schlomp.space/tastytea/mastodonpp
+    License: AGPL-3.0-only
+
+  nlohmann-json
+  From: Niels Lohmann and community
+        https://github.com/nlohmann/json
+  License: MIT
+
+  Qt
+    From: The Qt Project and community
+          https://www.qt.io/
+    License: GPL-2.0-only, GPL-3.0-only and LGPL-3.0-only
+
+
+  CMake
+    From: Kitware and community
+          https://cmake.org/
+    License: Custom license
+             https://github.com/Kitware/CMake/blob/master/Copyright.txt
+
+  Doxygen
+    From: Dimitri van Heesch and community
+          http://www.doxygen.org
+    License: GPL-2.0-only
+
+  Catch
+    From: Martin Hořeňovský and community
+          https://github.com/catchorg/Catch2
+    License: BSL-1
+
+  dpkg
+    From: The Debian project and community
+          https://packages.qa.debian.org/d/dpkg.html
+    License: GPL-2.0-or-later
+
+  rpm
+    From: Red Hat and community
+          https://rpm.org
+    License: GPL-2.0-only and LGPL-2.0-only
+
+
+The following files are copied from other projects:
+
+  FindFilesystem.cmake
+    From: CMake Community Modules
+          https://github.com/vector-of-bool/CMakeCM
+    License: BSD-3-Clause License
+
+  no_avatar.svg, originally mm.svg
+    From: ivatar
+          https://git.linux-kernel.at/oliver/ivatar/
+    License: AGPL-3.0-or-later

gui/FediPotato.qrc

@@ -2,6 +2,7 @@
 <RCC version="1.0">
     <qresource prefix="/">
         <file alias="AUTHORS">../AUTHORS</file>
+        <file alias="CREDITS">../CREDITS</file>
         <file>images/no_avatar.svg</file>
     </qresource>
 </RCC>

gui/src/dialog_about.cpp

@@ -15,6 +15,7 @@ AboutDialog::AboutDialog(QDialog *parent)
                    += FediPotato::get_version().data());
 
     display_authors();
+    display_credits();
 }
 
 void AboutDialog::display_authors() const
@@ -30,4 +31,17 @@ void AboutDialog::display_authors() const
     }
 }
 
+void AboutDialog::display_credits() const
+{
+    QFile file(":/CREDITS");
+    if (file.open(QIODevice::ReadOnly))
+    {
+        label_credits->setText(file.readAll());
+    }
+    else
+    {
+        label_credits->setText(tr("Could not open :/CREDITS."));
+    }
+}
+
 } // namespace FediPotato

gui/src/dialog_about.hpp

@@ -34,6 +34,7 @@ public:
 
 private:
     void display_authors() const;
+    void display_credits() const;
 };
 
 } // namespace FediPotato

gui/ui/dialog_about.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
-    <height>200</height>
+    <width>600</width>
+    <height>400</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -104,8 +104,8 @@
            <rect>
             <x>0</x>
             <y>0</y>
-            <width>358</width>
-            <height>129</height>
+            <width>558</width>
+            <height>329</height>
            </rect>
           </property>
           <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -117,12 +117,23 @@
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
+             <property name="font">
+              <font>
+               <family>Monospace</family>
+              </font>
+             </property>
              <property name="text">
               <string/>
              </property>
+             <property name="textFormat">
+              <enum>Qt::PlainText</enum>
+             </property>
              <property name="alignment">
               <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
              </property>
+             <property name="openExternalLinks">
+              <bool>true</bool>
+             </property>
              <property name="textInteractionFlags">
               <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
              </property>
@@ -134,6 +145,56 @@
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="tab_credits">
+      <attribute name="title">
+       <string>Credits</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QScrollArea" name="scrollArea_2">
+         <property name="widgetResizable">
+          <bool>true</bool>
+         </property>
+         <widget class="QWidget" name="scrollAreaWidgetContents_2">
+          <property name="geometry">
+           <rect>
+            <x>0</x>
+            <y>0</y>
+            <width>558</width>
+            <height>329</height>
+           </rect>
+          </property>
+          <layout class="QVBoxLayout" name="verticalLayout">
+           <item>
+            <widget class="QLabel" name="label_credits">
+             <property name="font">
+              <font>
+               <family>Monospace</family>
+              </font>
+             </property>
+             <property name="text">
+              <string/>
+             </property>
+             <property name="textFormat">
+              <enum>Qt::PlainText</enum>
+             </property>
+             <property name="alignment">
+              <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+             </property>
+             <property name="openExternalLinks">
+              <bool>true</bool>
+             </property>
+             <property name="textInteractionFlags">
+              <set>Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </widget>
+       </item>
+      </layout>
+     </widget>
     </widget>
    </item>
   </layout>