Added NOTES

NOTES.md

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+I figured out GitHub's styles mostly by brute force, looking at source listings
+and eyeballing the `class=` attributes. Here are the notes I took along the way
+for each class. It's by no means complete and only represents what I observed in
+the few files I checked.
+
+* **bp:** Special variable e.g. `__FILE__` or `None`
+
+* **c:** HTML, CSS comment
+* **c1:** Single-line comment  (`# ...` or `// ...`)
+* **cm:** Multi-line comment (`/* ... */`)
+
+* **cp:** Declaration e.g. `#include ...` or `<!DOCTYPE ...>`
+
+* **gd:** Diff deletion
+* **gd.x:** Diff inline deletion
+* **gi:** Diff insertion
+* **gi.x:** Diff inline insertion
+
+* **k:** Keyword e.g. `this`, `else`, `do`, or CSS's `margin`, `bold`
+* **kd:** Variable, function declaration
+* **kt:**	Type e.g. `int`, `void`
+
+* **m:** Literal value e.g. `800px` in CSS
+* **mi:** Integer value e.g. `55`, `8L`
+* **mf:** Float value e.g. `1.5`
+
+* **n:**	Generic identifier/variable name
+* **na:**	HTML attr name=
+* **nb:** Declarations and special words, e.g.  `document` in JavaScript, `require` in Ruby, `NULL` in C
+* **nc:** CSS class rule, Ruby class declaration
+* **nf:** CSS id rule, C function declaration
+* **no:** Ruby constant
+* **nn:** Python module name e.g. "utils" in `import utils`
+* **nt:** HTML tag, Haml tag, CSS tag rule
+* **nv:** Bash variable name
+* **nx:** JavaScript variable name or function call
+
+* **o:** Operators and symbols, e.g. `:`, `=`, `+`, `=>`, `::`
+
+* **p:** Brackets and grouping symbols, e.g. `{}`, `[]`, `()`, `,` in JavaScript, `/` in Haml (e.g. `%br/`)
+* **px:**	Property in JavaScript, e.g. "log" in `console.log`
+
+* **s:** Quoted HTML attribute value
+* **s1:**	Single-quoted string
+* **s2:** Double-quoted string
+* **ss:**	Ruby symbol (`:through`)
+* **se:**	`\\` in Bash (line continuation)
+* **si:** String interpolation
+* **sr:** Regular expression
+
+