add basic mdbook doc

doc/.gitignore

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+book

doc/book.toml

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+[book]
+authors = ["Saji Champlin"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Groovylight"

doc/src/SUMMARY.md

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+# Summary
+
+- [Insert Coin](./ch1_insert_coin.md) an introduction to modern retro gaming experiences.
+- [Background](./ch2-background.md) explains the rationale behind this project.
+- [Getting Started](./get-started.md) everything you need to play games
+- [Going further](./going-further)

doc/src/chapter_1.md

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+# Chapter 1

flake.nix

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             # for building the simulator
             cmake
             ninja
+            mdbook
           ];
         };
       });