Add documentation

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 # LisiblePNG - a PNG decoder
 
 This PNG decoder is meant to be used in my other C projects.
+
+## Supported features
+
+This is a simple implementation of a PNG decoder, it currently implements the following features:
+- Greyscale wihout alpha
+- Truecolour without alpha, without palette
+- 1 to 16 bit depth samples
+- All PNG filtering methods
+
+## Building
+
+```bash 
+meson setup <builddir>
+meson compile -C <builddir>
+```