Add Contributing.md

Author: kblok

CONTRIBUTING.md

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+# How to Contribute
+
+If you are interested in contributing to Puppeteer Sharp, Thank you!
+
+Coding is not for lonely wolves. Welcome to the pack!
+
+The project has a clear roadmap we want to follow. If you want to contribute, ask before submitting a PR. We will analyze if it’s the right moment to implement that feature or not.
+If you don’t know what to do, ASK! We have many many things to implement :)
+
+## Getting setup
+
+1. Clone this repository using your favorite tool
+
+2. Create a self signed certificate:
+
+The test server requires a self-signed certificate at this location: `.\lib\PuppeteerSharp.TestServer\testCert.cer`
+
+You can run this PowerShell script on Windows
+
+```
+New-SelfSignedCertificate -Subject "puppeteer" -FriendlyName "Puppeteer" -CertStoreLocation "cert:\LocalMachine\My"
+Get-ChildItem -Path cert:\LocalMachine\my | where { $_.subject -eq "CN=puppeteer" } | Export-Certificate -FilePath .\lib\PuppeteerSharp.TestServer\testCert.cer
+```
+
+On MacOS, you can create an “SSL Client” certificate using the Keychain Access app and then export it to `.\lib\PuppeteerSharp.TestServer\testCert.cer`
+
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on pull requests.
+
+## Code Style
+
+Though this list will change over time, these are the things to consider now:
+ * [We are team spaces](https://www.youtube.com/watch?v=SsoOG6ZeyUI).
+ * Try to follow the current style.
+ * Don’t reinvent the wheel.
+
+## Commit Messages
+
+Don’t worry about commit messages or about how many commits your PR has. [Your PR will be squashed](https://help.github.com/articles/about-pull-request-merges/#squash-and-merge-your-pull-request-commits), so the commit message will be set at that time.
+
+## Writing Tests
+
+Every feature should be accompanied by a test.
+
+Every public api event/method should be accompanied by a test.