Added CONTRIBUTING.md guide

Author: coot

CONTRIBUITING.md

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+# Building
+
+The project is build with `cabal-install`.  You might need to run `cabal
+update` after cloning the repository (to update [`Cardano Haskell
+Packages`][CHaP] (`ChaP`) index).
+
+# Using in your project
+
+Currently the package is published to [`CHaP`][CHaP].  In future it will be
+published to `Hackage`.  If you want to pull it from [`CHaP`][CHaP], this is
+relatively easy to setup; for example, checkout the
+[`cabal.project`](https://github.com/input-output-hk/typed-protocols/blob/master/cabal.project)
+file.  Alternatively, you can relay on `source-repository-package` stanza in
+a `cabal.project` file.
+
+# Testing
+
+The `typed-protocols-examples` package contains two simple protocols `PingPong`
+& `ReqResp` which are used for illustration & testing.
+
+```
+cabal run typed-protocols-examples:test
+```
+
+# Code Style
+
+Please follow local style.  For a more detailed style guide see
+[link](https://github.com/input-output-hk/ouroboros-network/blob/master/docs/StyleGuide.md).
+
+# Pull Requests
+
+Each commit shall be small and preferably address one thing at a time.  Well
+organised & documented commits make it much easier for the maintainers to
+review them.
+
+New features should be well documented & tested, which means including new
+tests as necessary.  You might be asked by the maintainers to write & include
+additional tests.
+
+Each commit should build & test, at least the package you are changing.  You
+can update other packages from this repository in a subsequent commit.
+
+Please use a draft PRs if the work is still in progress.
+
+We require all commits to be signed, see [this guide][gh-signing-commits].
+
+If your pull requests resolves an existing issue, please link your PR to that
+issue, see [GitHub documentation][gh-link-issue].
+
+
+[CHaP]: https://github.com/input-output-hk/cardano-haskell-packages/
+[gh-link-issue]: https://docs.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue
+[gh-signing-commits]: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits