docs: Use md for CONTRIBUTING

Author: Stranger6667

.pre-commit-config.yaml

@@ -58,10 +58,3 @@ repos:
       - id: mypy
         exclude: ^(docs/|test/).*$
         args: ["--ignore-missing-imports"]
-
-  - repo: https://github.com/myint/rstcheck
-    rev: v6.1.2
-    hooks:
-      - id: rstcheck
-        additional_dependencies:
-          - sphinx==4.5.0

CONTRIBUTING.md

@@ -0,0 +1,47 @@
+# Contributing to hypothesis-graphql
+
+Welcome! I am happy that you are here :)
+
+## Report bugs
+
+Report bugs for Hypothesis-GraphQL in the [issue tracker](https://github.com/Stranger6667/hypothesis-graphql/issues).
+
+If you are reporting a bug, please:
+
+-   Write a simple and descriptive title to identify the problem.
+-   Describe the exact steps which reproduce the problem in as many
+    details as possible.
+-   Describe the behavior you observed after following the steps and
+    point out what exactly is the problem with that behavior.
+-   Explain which behavior you expected to see instead and why.
+-   Include Python / Hypothesis-GraphQL versions.
+
+It would be awesome if you can submit a failing test that demonstrates
+the problem.
+
+## Submitting Pull Requests
+
+1.  Fork the repository.
+
+2.  Enable and install [pre-commit](https://pre-commit.com) to ensure style-guides and code checks are followed.
+
+3.  Target the `master` branch.
+
+4.  Follow **PEP-8** for naming and [black](https://github.com/psf/black) for formatting.
+
+5.  Tests are run using `tox`:
+
+        tox -e py37
+
+    The test environment above is usually enough to cover most cases
+    locally.
+
+For each pull request, we aim to review it as soon as possible. If you
+wait a few days without a reply, please feel free to ping the thread by
+adding a new comment.
+
+At present the core developers are:
+
+-   Dmitry Dygalo [@Stranger6667](https://github.com/Stranger6667)
+
+Thanks!