Show example commit for adding rule

Author: CalebFenton

README.md

@@ -184,3 +184,25 @@ To match a commit where any file is not a text file and includes "42":
 ```
 !is_txt && has_42
 ```
+
+### Submitting Your Rules
+
+To submit a rule to this project, use this commit as an example: [https://github.com/srcclr/commit-watcher/commit/3ae9e2d340f1ac4d10c9ebffae64c22b0a6ac706](https://github.com/srcclr/commit-watcher/commit/3ae9e2d340f1ac4d10c9ebffae64c22b0a6ac706)
+
+Let's break down the rule a bit:
+
+```
+{
+  name: 'markdown_file',
+  rule_type_id: 1,
+  value: '(?i)\.(md|markdown)\z',
+  description: 'Markdown file'
+}
+```
+
+There are four different values for the rule:
+
+1. name - unique name, valid characters are alpha numeric, '-', '_', and '.'
+2. rule\_type\_id - this is the ID for a rule type described above
+3. value - regular expression; this example could be read as "case insensitive, starts with a '.' and is followed either by 'md' or 'markdown' and then the end of the string"
+4. description - free text field for describing the rule