Added CONTRIBUTING.md

Author: jpdillingham

CONTRIBUTING.md

@@ -0,0 +1,18 @@
+# How to Contribute
+
+1. Create an issue
+   - Clearly state your problem or idea
+   - If you'd like to contribute code, state how you intend to solve the problem
+   - For the best chance of having your code merged, wait until I've responded.
+2. Fork the repo
+3. Make your changes
+4. Submit a Pull Request
+
+## Rules
+
+- Test coverage must remain 100% unless you have a _really_ good reason.
+- Use the analysis ruleset included in the repo.  Your code must be free of rule violations from analyzers, including StyleCop.
+- All code must reside in Arguments.cs.  This allows users to include the library in their project as source without creating clutter.
+- Follow existing conventions.  This includes code and documentation. 
+- Tread lightly.  Sweeping changes are not likely to be merged.
+

Utility.CommandLine.Arguments.sln

@@ -11,6 +11,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		.travis.yml = .travis.yml
 		appveyor.yml = appveyor.yml
+		CONTRIBUTING.md = CONTRIBUTING.md
 		LICENSE = LICENSE
 		README.md = README.md
 	EndProjectSection