chore: update readme

Author: DjDeveloperr

README.md

@@ -7,16 +7,32 @@
 
 OpenGL bindings & WebGL API implementation for Deno.
 
+Note: WebGL API is WIP.
+
 ## Usage
 
 Import native OpenGL from `/api/gl[es|es2]{version}.ts`.
 
+All the functions map 1:1 with the C OpenGL API.
+
 Extensions are present in `/api/ext/*`.
 
 Before using the API, make sure to create OpenGL context and load function
 pointers using `load` function exported, which accepts a `getProcAddress`
 callback ([DWM](https://github.com/deno-windowing/dwm) handles both).
 
+```ts
+// GLES2 3.2 API
+import * as gl from "https://deno.land/x/[email protected]/api/gles23.2.ts";
+
+// Initialize function pointers
+gl.load(yourGetProcAddress);
+
+// ... Initialize context (for example using DWM)
+
+// Use APIs from `gl` i.e. gl.DrawElements(...)
+```
+
 For using WebGL, `mod.ts` exports `WebGLCanvas` which handles both window and
 context creation.