Improved documentation, added images.

README.md

@@ -3,6 +3,15 @@
 You get the images as `Magick::Image`. This allows you to make all kinds of
 modifications.
 
+![](https://doc.schlomp.space/identiconpp/identicon1.png
+"4x4 identicon, ltr_symmetric, 20px padding")
+![](https://doc.schlomp.space/identiconpp/identicon2.png
+"5x5 identicon, sigil")
+![](https://doc.schlomp.space/identiconpp/identicon3.png
+"5x5 identicon, ltr_asymmetric")
+![](https://doc.schlomp.space/identiconpp/identicon4.png
+"6x4 identicon, ltr_symmetric, 10px padding")
+
 ## Features
 
 * [x] Symmetric identicons
@@ -21,6 +30,10 @@ to use a safe hashing algorithm for sensitive data (**not MD5**). You can select
 as many columns and rows as you like, but make sure you have enough entropy.
 If something seems to be wrong, exceptions will be thrown.
 
+The "sigil" algorithm generates the same results as
+[sigil](https://github.com/cupcake/sigil/) and
+[pydenticon](https://github.com/azaghal/pydenticon/).
+
 ### Example
 
 ```C++

src/identiconpp.hpp

@@ -40,8 +40,15 @@ public:
      */
     enum class algorithm
     {
+        //! Generates symmetric (vertically mirrored) identicons.
         ltr_symmetric,
+        //! Generates asymmetric identicons.
         ltr_asymmetric,
+        /*!
+         * Generates the same results as
+         * [sigil](https://github.com/cupcake/sigil/) and
+         * [pydenticon](https://github.com/azaghal/pydenticon/).
+         */
         sigil
     };