update docs

Author: mjansson

Diff for: README.md

@@ -6,3 +6,60 @@ Created by Mattias Jansson / Rampant Pixels - <http://www.rampantpixels.com>
 Please consider our Patreon - https://patreon.com/rampantpixels
 
 This library is put in the public domain; you can redistribute it and/or modify it without any restrictions.
+
+# Overview
+
+Small in-place JSON parser without any allocation. Entry points for both
+standard JSON and simplified JSON data parsing. All character data must be
+in UTF-8 format.
+
+Strings are not automatically unescaped. Use json_unescape/json_escape to
+perform unescaping and espacing of strings. Unescaping can be done in-place
+to avoid memory allocations.
+
+Simplified JSON as parsed by this library has the following differences
+from standard JSON:
+- The equal sign = is used to define key-value pairs instead of the colon :
+- Quotes around string keys in key-value pairs are optional, unless you need
+the key to contain either whitespace or the equal sign =
+- Commas are optional in object and array definitions
+- Each SJSON file is always interpreted as a definition for a single object.
+You can think of this as an implicit set of curly quotes { ... } that surround
+the contents of the file
+
+Kudos to Niklas Gray for SJSON syntax,
+http://bitsquid.blogspot.se/2009/10/simplified-json-notation.html
+
+# Usage
+
+	json_size_t
+	json_parse(const char* buffer, json_size_t size,
+	           struct json_token_t* tokens, json_size_t capacity);
+
+	static json_size_t
+	sjson_parse(const char* buffer, json_size_t size,
+	            struct json_token_t* tokens, json_size_t capacity);
+
+Parse the given memory buffer as JSON or SJSON into the given token array of
+given capacity. Returns the number of parsed tokens, which can be greater
+than the supplied capacity to indicate the need for a larger array.
+
+String identifiers and values are not unescaped. This must be performed manually
+on each string of interest.
+
+	static json_size_t
+	json_unescape(char* buffer, json_size_t capacity, const char* string, json_size_t length);
+
+Unescape a JSON identifier or value string. Buffer can be
+pointing to same memory area as string (in-place unescaping).
+
+	static json_size_t
+	json_escape(char* buffer, json_size_t capacity, const char* string, json_size_t length);
+
+Escape a JSON identifier or value string. Buffer can NOT be
+pointing to same memory area as string.
+
+	static bool
+	json_string_equal(const char* rhs, size_t rhs_length, const char* lhs, size_t lhs_length);
+
+Utility function to do bounded string compare.