Introduced contributions.

CONTRIBUTING.md

@@ -0,0 +1,12 @@
+# Contribution Guidelines
+
+Any form of contribution is accepted, however, please note the following.
+
+## Please note noncompliant issues or PRs will be closed without discussion
+
+- Note the [Design Goals](https://github.com/technion/ruby-argon2/blob/master/README.md#design) documented for the project and work within them
+- Commits should be squashed to a single commit per pull. An exception is that a test suite add or change, followed by code update, may be presented as two commits in one pull
+- Each individual commit should have a descriptive commit message. "Update <file>" is not suitable
+- This is a coding project. Your political goals are not relevant
+- Any complex or large code will probably require a test
+- If an issue is felt to be a security concern, please contact me privately on: technion@lolware.net

README.md

@@ -98,9 +98,8 @@ If you are providing your own salt, you are probably using it wrong. The design
 
 ## Contributing
 
-Any form of contribution is appreciated, however, please note the design goals above and work within them.
+Any form of contribution is appreciated, however, please review [CONTRIBUTING.md](CONTRIBUTING.md).
 
-If an issue is felt to be a security concern, please contact me privately on: technion@lolware.net. If required, you may encrypt with [my GPG key](https://lolware.net/technion-GPG-KEY).
 
 ## Building locally/Tests