Add installation notes to README

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@@ -18,6 +18,49 @@ Solution for /DFS-33/, generated on /2021-11-03/ (click to play).
 
 [[https://andinus.unfla.me/resources/projects/fornax/2021-11-03-DFS-33.mp4][https://andinus.unfla.me/resources/projects/fornax/2021-11-03-DFS-33.png]]
 
+* Installation
+
+~fornax~ is written in Raku, it can be installed with ~zef~. You can also
+run it without ~zef~,  just run ~raku -Ilib bin/fornax~ from within the
+source directory.
+
+- *Note*: ~Cairo~ module & ~ffmpeg~ program is required.
+
+** Release
+
+1. Run ~zef install fornax~.
+
+Fornax should be installed, try running ~fornax --version~ to confirm.
+
+- Solving programs / solutions are not included in the distribution, get
+  them from this repository.
+
+** From Source
+
+You can either download the release archive generated by cgit/GitHub or
+clone the project if you have ~git~ installed.
+
+*** Without ~git~
+
+1. Download the release:
+   - https://git.unfla.me/andinus/fornax
+   - https://github.com/andinus/fornax/releases
+2. Extract the file.
+3. Run ~zef install .~ in source directory.
+
+*** With ~git~
+
+All commits by /Andinus/ will be signed by this [[https://andinus.nand.sh/static/D9AE4AEEE1F1B3598E81D9DFB67D55D482A799FD.asc][PGP Key]].
+
+#+begin_src sh
+# Clone the project.
+git clone https://git.tilde.institute/andinus/fornax
+cd fornax
+
+# Install fornax.
+zef install .
+#+end_src
+
 * Documentation
 
 Fornax parses /Fornax format/, generates a ~PNG~ for each iteration which is