Merge pull request #2044 from mgreter/feature/github-contrib-hints

Add initial CONTRIBUTING.md and ISSUE_TEMPLATE.md

Author: mgreter

.github/CONTRIBUTING.md

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+# Contributing to LibSass
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+The following is a set of guidelines for contributing to LibSass, which is hosted in the [Sass Organization](https://github.com/sass) on GitHub.
+These are just guidelines, not rules, use your best judgment and feel free to propose changes to this document in a pull request.
+
+LibSass is a library that implements a [sass language] [1] compiler. As such it does not directly interface with end users (frontend developers).
+For direct contributions to the LibSass code base you will need to have at least a rough idea of C++, we will not lie about that.
+But there are other ways to contribute to the progress of LibSass. All contributions are done via github pull requests.
+
+You can contribute to the [LibSass documentation] [2] or provide additional [spec tests] [3] (we will gladly point you in the direction
+of the dirty corners in LibSass). Foremost we rely on good and concise bug reports for issues the spec tests do not yet catch.
+
+[1]: http://sass-lang.com/
+[2]: https://github.com/sass/libsass/tree/master/docs
+[3]: https://github.com/sass/sass-spec

.github/ISSUE_TEMPLATE.md

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+## Precheck: My Sass isn't compiling
+- [ ] Check if you can reproduce the issue via [SourceMap Inspector] [5] (updated regularly).
+- [ ] Validate official ruby sass compiler via [SassMeister] [6] produces your expected result.
+- [ ] Search for similar issue in [LibSass] [1] and [node-sass] [2] (include closed tickets)
+- [ ] Optionally test your code directly with [sass] [7] or [sassc] [2] ([installer] [4])
+
+## Precheck: My build/install fails
+- [ ] Problems with building or installing libsass should be directed to implementors first!
+- [ ] Except for issues directly verified via sassc or LibSass own build (make/autotools9
+
+## Craft a meaningfull error report
+- [ ] Include the version of libsass and the implementor (i.e. node-sass or sassc)
+- [ ] Include information about your operating system and environment (i.e. io.js)
+- [ ] Either create a self contained sample that shows your issue ...
+- [ ] ... or provide it as a fetchable (github preferred) archive/repo
+- [ ] ... and include a step by step list of command to get all dependencies
+- [ ] Make it clear if you use indented or/and scss syntax
+
+## My error is hiding in a big code base
+1. we do not have time to support your code base!
+2. to fix occuring issues we need precise bug reports
+3. the more precise you are, the faster we can help you
+4. lazy reports get overlooked even when exposing serious bugs
+5. it's not hard to do, it only takes time
+- [ ] Make sure you saved the current state (i.e. commit to git)
+- [ ] Start by uncommenting blocks in the initial source file
+- [ ] Check if the problem is still there after each edit
+- [ ] Repeat until the problem goes away
+- [ ] Inline imported files as you go along
+- [ ] Finished once you cannot remove more
+- [ ] The emphasis is on the word "repeat" ...
+
+## What makes a code test case
+
+Important is that someone else can get the test case up and running to reproduce it locally. For this
+we urge you to verify that your sample yields the expected result by testing it via [SassMeister] [6]
+or directly via ruby sass or node-sass (or any other libsass implementor) before submitting your bug
+report. Once you verified all of the above, you may use the template below to file your bug report.
+
+### Title: Be as meaningfull as possible in 60 chars if possible
+
+input.scss
+```scss
+test {
+  content: bar
+}
+```
+
+libsass 3.5.5
+```css
+test {
+  content: bar; }
+```
+
+ruby sass 3.4.21
+```css
+test {
+  content: bar; }
+```
+
+version info:
+```cmd
+$ node-sass --version
+node-sass       3.3.3   (Wrapper)       [JavaScript]
+libsass         3.2.5   (Sass Compiler) [C/C++]
+```
+
+[1]: https://github.com/sass/libsass/issues?utf8=%E2%9C%93&q=is%3Aissue
+[2]: https://github.com/sass/node-sass/issues?utf8=%E2%9C%93&q=is%3Aissue
+[3]: https://github.com/sass/sassc
+[4]: http://libsass.ocbnet.ch/installer/
+[5]: http://libsass.ocbnet.ch/srcmap/
+[6]: http://www.sassmeister.com/
+[7]: https://rubygems.org/gems/sass