added library categories

README.md

@@ -3,17 +3,17 @@ stb
 
 single-file public domain libraries for C/C++
 
-library | description
---------- | ---------
-**stb_image.c**       | image loading/decoding from disk/memory: JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC
-**stb_vorbis.c**      | decode ogg vorbis files from memory to float/16-bit signed output
-**stb_truetype.h**    | parse, decode, and rasterize characters from truetype fonts
-**stb_image_write.h** | image writing to disk
-**stb_textedit.h**    | guts of a text editor for games etc implementing them from scratch
-**stb_dxt.h**         | Fabian "ryg" Geisen's real-time DXT compressor
-**stb_perlin.h**      | revised Perlin noise (3D input, 1D output)
-**stb_c_lexer.h**     | simplify writing parsers for C-like languages
-**stb.h**             | helper functions for C, mostly redundant in C++, basically author's personal stuff
+library | category | description
+--------- | --------- | ---------
+**stb_image.c**       | graphics | image loading/decoding from disk/memory: JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC
+**stb_vorbis.c**      | audio    | decode ogg vorbis files from memory to float/16-bit signed output
+**stb_truetype.h**    | graphics | parse, decode, and rasterize characters from truetype fonts
+**stb_image_write.h** | graphics | image writing to disk
+**stb_textedit.h**    | UI       | guts of a text editor for games etc implementing them from scratch
+**stb_dxt.h**         | 3D graphics | Fabian "ryg" Geisen's real-time DXT compressor
+**stb_perlin.h**      | 3D graphics | revised Perlin noise (3D input, 1D output)
+**stb_c_lexer.h**     | parsing | simplify writing parsers for C-like languages
+**stb.h**             | misc | helper functions for C, mostly redundant in C++; basically author's personal stuff
 
 FAQ
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