Added a skeleton for the lexer

README.md

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+# Lispy stuff
+
+Simple lisp-ish language compiler written in C++.
+
+Right now it doesn't compile much - it's just a parser.
+The goal is to emit bytecode. The bytecode format is not decided yet.
+
+## Build
+
+I use cmake for the build system. I prefer to build out-of-tree,
+here's how to build if you've never used cmake:
+
+```bash
+cd build
+cmake ..
+make
+```
+
+## Development
+
+I use clangd as the language server. Appropriate `compile_commands.json`
+(required for clangd, otherwise it can not find include files) is provided.
+If you'd like to generate them yourself, just use cmake:
+
+```bash
+cd build
+cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=1 ..
+cp compile_commands.json ../
+```
+
+