Create CONTRIBUTING.md

CONTRIBUTING.md

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+# BOUNTY Program
+ARK has a bounty program for all accepted PR (Pull Requests) for this repository
+
+More information can be found at https://blog.ark.io/200-000-ark-bounty-for-developers-in-the-1st-year-76aa44304012
+
+Before pushing PR, please [jump in our slack #development](https://ark.io/slack) channel in order to discuss your contributions or to connect with other ARKvelopers.
+
+# Guidelines
+- pickup any of the existing issues or if you find an issue make a PR,
+- only one PR reward will be awarded per issue it fixes,
+- solving an open issue will increase your chances to be picked up as any of the monthly bounty winners.
+
+# Accepted PR
+- increase general code quality,
+- add meaningfull tests,
+- correct bug,
+- add new features,
+- improve documentation,
+- create something new for ARK.