Adds docs for watcher-c

watcher-c/readme.md

@@ -0,0 +1,39 @@
+# Using the watcher library from C
+
+The watcher can also be used from C by including the `watcher-c.h` file on compilation and in your project.
+
+You can cross compile the library via the `watcher-c/cross-compile.sh` script or download the precompiled library from
+the releases.
+
+### Compiling the library from source
+
+If you want to compile the library yourself you can follow the following example:
+
+First check out a branch or release, here we'll use the 'next' branch.
+You can then compile the library with meson or a tool of your choice, 
+we will use `c++`.
+
+```bash
+curl -L https://github.com/e-dant/watcher/archive/refs/heads/next.tar.gz | tar xz
+cd watcher-next/watcher-c
+c++ -o libwatcher-c.so ./src/watcher-c.cpp -I ./include -I ../include -std=c++17 -fPIC -shared
+```
+
+This gives us a `libwatcher-c.so` library that you can now install on your system.
+In most container based environments you can just copy the library like this:
+
+```bash
+cp libwatcher-c.so /usr/local/lib/libwatcher-c.so
+ldconfig
+```
+
+### Using the library in your C code
+
+After installing the library, copy the `watcher-c.h` file to your project and include it in your C code:
+
+```c
+#include "watcher-c.h"
+```
+
+You will then be able to use the functions 
+[provided by the library](https://github.com/e-dant/watcher?tab=readme-ov-file#the-library).