add docs

README.md

@@ -3,6 +3,8 @@ A simple Web Server written in C (learning purposes), it works only on Linux sys
 
 ## Requirements
 - [meson](https://mesonbuild.com/index.html)
+- [doxygen](https://www.doxygen.nl/)
+  - Optional, just to build the docs
 
 ## How to build
 ```bash
@@ -12,6 +14,13 @@ $ meson compile
 ```
 And then run `cws`!
 
+## Docs
+```bash
+$ git submodule update --init # inside the cws directory
+$ doxygen
+```
+And then open the `docs/html/index.html`.
+
 ## Roadmap
 - [x] Understading basic web server concepts
 - [ ] Basic server