Added drone file

.drone.yml

@@ -0,0 +1,57 @@
+pipeline:
+  gcc5:
+    image: gcc:5
+    pull: true
+    commands:
+      - echo "deb http://deb.debian.org/debian stretch main" >> /etc/apt/sources.list.d/stretch.list
+      - echo "APT::Default-Release \"jessie\";" >> /etc/apt/apt.conf.d/00default_release
+      - apt-get update -q
+      - apt-get install -qyt stretch cmake
+      - apt-get install -qy libconfig++-dev libxdg-basedir-dev
+      - rm -rf build && mkdir -p build && cd build
+      - cmake ..
+      - make VERBOSE=1
+      - make install DESTDIR=install
+  gcc6:
+    image: gcc:6
+    pull: true
+    commands:
+      - echo "deb http://deb.debian.org/debian stretch main" >> /etc/apt/sources.list.d/stretch.list
+      - echo "APT::Default-Release \"jessie\";" >> /etc/apt/apt.conf.d/00default_release
+      - apt-get update -q
+      - apt-get install -qyt stretch cmake
+      - apt-get install -qy libconfig++-dev libxdg-basedir-dev
+      - rm -rf build && mkdir -p build && cd build
+      - cmake ..
+      - make VERBOSE=1
+      - make install DESTDIR=install
+  gcc7:
+    image: gcc:7
+    pull: true
+    commands:
+      - apt-get update -q
+      - apt-get install -qy build-essential cmake pkg-config
+      - apt-get install -qy libconfig++-dev libxdg-basedir-dev
+      - rm -rf build && mkdir -p build && cd build
+      - cmake ..
+      - make VERBOSE=1
+      - make install DESTDIR=install
+  gcc8:
+    image: gcc:8
+    pull: true
+    commands:
+      - apt-get update -q
+      - apt-get install -qy build-essential cmake pkg-config
+      - apt-get install -qy libconfig++-dev libxdg-basedir-dev
+      - rm -rf build && mkdir -p build && cd build
+      - cmake ..
+      - make VERBOSE=1
+      - make install DESTDIR=install
+  notify:
+    image: drillster/drone-email
+    pull: true
+    host: cryptoparty-celle.de
+    secrets: [ email_username, email_password ]
+    from: drone@tzend.de
+    when:
+      status: [ changed, failure ]

README.md

@@ -4,7 +4,7 @@ necessary.
 
 ### Dependencies
 
-* C++ compiler
+* C++ compiler (Tested: g++ 5/6/7/8)
 * [cmake](https://cmake.org/)
 * [pkgconfig](https://pkgconfig.freedesktop.org/wiki/)
 * [libconfig++](https://github.com/hyperrealm/libconfig)