Add contribting guide

Contributing.md

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+# Contributing
+
+We love it when people help us out.
+
+## Having a problem?
+
+Search in the [Issues](https://github.com/KevM/tikaondotnet/issues?utf8=✓&q=is%3Aissue%20)
+as your problem may be a common one. If don't find your problem. Do [create an
+issue](https://github.com/KevM/tikaondotnet/issues/new). Contributors here will
+chime in when they can.
+
+## Getting Started
+
+Check out the [ReadMe](https://github.com/KevM/tikaondotnet). It should have
+everything you need to get started.
+
+### The Usual
+
+Did a new version of Tika come out and you want to get the Nuget updated? This is
+very common so check out the ReadMe on [Updating Tika](https://github.com/KevM/tikaondotnet#updating-tika).
+After you've got the new version building, [create a pull request](https://help.github.com/articles/using-pull-requests/).
+Once it is merged a [Nuget will be published](https://www.nuget.org/packages/TikaOnDotNet/).
+
+## How can I help? 
+
+This project typically [has a few up for grabs issues](https://github.com/KevM/tikaondotnet/issues?q=is%3Aissue+is%3Aopen+label%3Aup-for-grabs).