move codeowners from contributing file to the CODEOWNERS file

CODEOWNERS

@@ -0,0 +1,7 @@
+# CODEOWNERS: https://help.github.com/articles/about-codeowners/
+
+# Docs
+*.md    @barriebyron
+
+# Primary repo maintainers
+*    @dongsam @kogisin @hallazzang

CONTRIBUTING.md

@@ -1,18 +1,21 @@
 # Contributing
 
-We welcome contributions from anyone who is willing to create a new PR on farming module, make sure that you read and comply with this document. See the [open issues](https://github.com/tendermint/farming/issues) that we need help with. Feel free to inform us if you are willing to work on any issue. Note that the `master` branch contains the latest development version. 
+We welcome contributions to our codebase and documentation. 
+
+Before you create a PR on the farming module, make sure that you read and comply with this document. See the [open issues](https://github.com/tendermint/farming/issues) that we need help with. 
+
+Feel free to inform us if you are willing to work on an issue. Note that the `master` branch contains the latest development version. 
 
 We follow standard GitHub best practices: 
 
 - Fork the repository
 - Make sure your `branch` is from the tip of `master` branch
-- Make some commits to resolve an issue
+- Make your commits to resolve an issue
 - Submit a pull request to `master`
 
 General guidance:
 
 - Make sure you run tests by running `make test-all` locally to see there is any issue
-- Review all the checks on your PR and review code coverage report
-- Assign reviewers from code owners (@dongsam @kogisin @hallazzang)
+- Review all the checks on your PR and review the code coverage report
 
 Thank you for your contribution!