updating README with information on forking model

README.md

@@ -4,7 +4,18 @@ This is a repository of CSL citation styles.
 
 # Guidelines
 
-Files names for CSL style must follow these guidelines:
+## Style Submission or Edits
+
+To contribute to the style repository:
+
+1. fork the main repository
+2. create a temporary development branch and make your changes there
+3. commit your changes in one atomic commit per style
+4. issue a pull request to the main repository
+
+## File Names and and Style Identifiers
+
+Style id slugs and files names for CSL style must follow these guidelines:
 
 * all lower case
 * only valid characters are numbers, a-z letters, and single dash