Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+Contributors are encouraged to be a [member](https://www.openhwgroup.org/membership/) of the
+OpenHW Group.  New members are always welcome.
+
+## Getting Started
+The [OpenHW Work Flow](https://github.com/openhwgroup/core-v-docs/blob/master/verif/Common/OpenHWGroup_WorkFlow.pdf) document
+is required reading.  You will find information about the implementation and usage of the CORE-V verification environments
+in the [Verification Strategy](https://github.com/openhwgroup/core-v-docs/blob/master/verif/Common/OpenHWGroup_CORE-V_Verif_Strategy.pdf).
+
+## The Mechanics
+1. From GitHub: [fork](https://help.github.com/articles/fork-a-repo/) the [cv32e40p](https://github.com/openhwgroup/cv32e40p) repository
+2. Clone repository: `git clone https://github.com/[your_github_username]/cv32e40p`
+3. Create your feature branch: `git checkout -b <my_branch>.`<br> Please uniquify your branch name.  See the [Git Cheats](https://github.com/openhwgroup/core-v-verif/blob/master/GitCheats.md)
+for a useful nominclature.
+4. Make your edits...
+5. Commit your changes: `git commit -m 'Add some feature' -s`<br>...take note of that **-s**, it's important!
+6. Push feature branch: `git push origin <my_branch>`
+7. From GitHub: submit a pull request