Added explainer doc

Author: gregwhitworth

css-parser-api/readme.md

@@ -0,0 +1,18 @@
+CSS Parser Explainer
+==============================
+
+The CSS Parser API goal is to solve common use cases
+that web developers encounter where they want to parse
+a string that follows the syntax and grammar of CSS and
+utilize the browser's built in parser to return an object.
+
+Current Use Cases
+------------------
+* Be able to pass the following in to the parser and get
+a representative object in return
+    * property and value
+    * css rule
+    * full stylesheet
+* Be able to turn off/on error handling which will enable
+the capability to use the parser for custom language needs
+or CSS polyfilling.