docs: update README

README.md

@@ -4,3 +4,26 @@
 
  [Here you can find the deployment of the latest release.](https://eliasnijs.xyz/projects/boids/boids.html)
 
+## Build
+
+To build the project, you need to have emscripten installed. You can find the installation instructions [here](https://emscripten.org/docs/getting_started/downloads.html).
+
+After you have installed emscripten, clone the repository:
+
+```bash
+git clone --recurse-submodules [email protected]:eliasnijs/c-web-boids.git
+```
+
+Install the dependencies with the following commands:
+
+```bash
+cd libs 
+./buildlibs.sh
+cd ..
+```
+
+Then you can build the project with the following commands:
+
+```bash
+./build.sh
+```