Adds codeowners and contributing

Author: Russell Warwick

CODEOWNERS

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+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# @global-owner1 and @global-owner2 will be requested for
+# review when someone opens a pull request.
+* @russshark @markdarling @TheiOSDude @Christopher1613 @vrutings
+

CONTRIBUTING.md

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+
+
+## Contributing
+
+To contribute a new style rule first fork the repo and create your branch from `master. Then open a PR and propose the rule following the structure below.
+
+If you have an idea that's not completely fleshed out, please [open an issue](https://github.com/gymshark/ios-stack-kit/issues) to discuss.
+
+#### New Rule Structure 
+
+* A short description.
+* Any notes that might be related
+* A code example describing the incorrect and correct behaviours if necessary 
+