docs: update README with quick documentation

README.md

@@ -2,7 +2,35 @@
 
 # GLSL Glyphs Generator
 
-> Generate GLSL ready 8x8 glyph maps and usable functions
+> Generate GLSL ready 8x8 glyph maps and usable functions.
+
+Reads each 8x8 glyph into 4x4 squares then converts them into (0-65535) integers.
+
+```txt
+ ██████      0x151E, 0x8A87, 0xE19D, 0x789B,
+█      █
+█ █  █ █       ███    ███     █ ██    ██ █
+█      █  ->  █          █    █  █    █  █
+█ ████ █      █ █      █ █    █          █
+█  ██  █      █          █     ███    ███
+█      █
+ ██████
+```
+
+Writes it into GLSL ready files to use it easily in shaders
+
+```glsl
+const int cp437_glyphs[] = int[1024](
+    0x0000, 0x0000, 0x0000, 0x0000, // 0x00, EMPTY
+    0x151E, 0x8A87, 0xE19D, 0x789B, // 0x01, SMILEY
+    // ...
+);
+
+bool cp437(vec2 pos, int code)
+{
+    // ...
+}
+```
 
 ## Usage
 
@@ -88,4 +116,5 @@ release-%            release major/minor/patch
 * [x] Generate a separate sentences file
 * [ ] Custom height glyph map
 * [ ] Custom width glyph map
+* [ ] More compact data using GLSL ints
 * [ ] separated sets/patterns