Update CONTRIBUTING.md

.github/CONTRIBUTING.md

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-Make sure check in with me first or confirm your desired features line up with our roadmap: https://github.com/pirate/ArchiveBox#roadmap
+# Contribution Process
+
+1. Confirm your desired features fit into our bigger project goals roadmap: https://github.com/pirate/ArchiveBox#roadmap
+2. Check in with me before starting development to make sure your work wont conflict with or duplicate existing work
+3. Open an issue with your planned implementation to discuss
+4. Setup your dev environment, make some changes, and test using the test input files
+5. Commit, push, and submit a PR and wait for review feedback
+6. Have patience, don't abandon your PR! We love contributors but we all have day jobs and don't always have time to respond to notifications instantly. If you want a faster response, ping @theSquashSH on twitter or Patreon.
+
+**Useful links:**
+
+- https://github.com/pirate/ArchiveBox/issues
+- https://github.com/pirate/ArchiveBox/pulls
+- https://github.com/pirate/ArchiveBox/wiki/Roadmap
+- https://github.com/pirate/ArchiveBox/wiki/Install#manual-setup
+
+### Development Setup
+
+```bash
+git clone https://github.com/pirate/ArchiveBox
+cd ArchiveBox
+# Optionally create a virtualenv
+pip install -r requirements.txt
+pip install -e .
+```
+
+### Running Tests
+
+```bash
+./bin/archive tests/*
+# look for errors in stdout/stderr
+# then confirm output html looks right
+
+# if on >v0.4 run the django test suite:
+archivebox manage test
+```
+
+### Getting Help
+
+Open issues on Github or contact me https://sweeting.me/#contact.