Add contributing info and issue template (dotliquid#246) [skip ci]

contributing.md

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+## Getting started
+
+**Getting started with Git and GitHub**
+
+ * [Setting up Git for Windows and connecting to GitHub](http://help.github.com/win-set-up-git/)
+ * [Forking a GitHub repository](http://help.github.com/fork-a-repo/)
+ * [The simple guide to GIT guide](http://rogerdudler.github.com/git-guide/)
+
+Once you're familiar with Git and GitHub, clone the repository.  
+The requirements are [Visual Studio 2017](https://www.visualstudio.com/) and [.net Core 1.0.3](https://www.microsoft.com/net/download/core#/sdk).
+
+## Discussing ideas 
+
+* [Gitter Chatroom](https://gitter.im/dotliquid/dotliquid)
+* [GitHub Issues](https://github.com/dotliquid/dotliquid/issues/new)
+
+**The functionality is based as much as possible on existing functionality in [Liquid](https://shopify.github.io/liquid/)**
+
+Each new feature must have been discussed first before submitting it in a PR.
+
+## Coding conventions
+
+We prefer spaces over tabs for indentation.  
+We have an [editorconfig](http://EditorConfig.org) [file](./.editorconfig) if you use an editor or plugin respecting it.
+
+## Testing
+
+Tests are mandatory for new functionality, please add some in the tests suite.
+You can see the result either:
+- in Visual Studio or other IDE supporting NUnit 3
+- on [AppVeyor](https://ci.appveyor.com/project/tgjones/dotliquid) after the PR is submitted

issue_template.md

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+### Dotliquid version
+
+### Expected behavior
+
+### Actual behavior
+
+### Steps to reproduce the Problem (you can add files)