Add project retrospective

PROJECT_RETROSPECTIVE.md

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+# A look back on what I learned
+
+## why?
+
+I came across an art/rendering style called "sprite stacking".
+I found sprite stacking very interesting in comparison to traditional methods,
+and wanted to experiment with the style.
+
+## challenge
+
+This was my first big graphics-based project. Computer graphics
+at the low-level was new to me. I took this as an opportunity to
+learn the basics of OpenGL. This learning process was the most
+difficult part of the project, especially the domain-specific
+rendering techniques used.
+
+## how?
+
+I found some [great tutorials](https://learnopengl.com) to get started,
+and though these helped, I also did a lot of individual
+learning through experimentation and discussion with peers.
+
+## results
+
+In the end, the library had most of the functionality
+I originally wanted. Here's an example with only 7 library calls:
+![example gif](./example.gif)
+The library can draw up to 256 layers of icons in a grid,
+with optional offsets and tints per icon.
+
+## evaluation
+
+Besides learning the basics of OpenGL, I also learned
+how to use CMake to help build the library. Also, I set up
+continuous integration for automated testing on a git commit.
+If I were to rewrite this library, I would definitely invest more
+into the automated testing process.

README.md

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-# termg
+# glerminal
 
+glerminal is a tile-based graphics library created
+with the intent to use a sprite-stacking art style.