[ci skip] added github issue templates and contributing guidelines

.github/ISSUE_TEMPLATE.md

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+Please don't file issues directly, use one of our available templates:
+
+Bugs: https://github.com/martibosch/pylandstats/issues/new?template=bug.md
+Feature Requests: https://github.com/martibosch/pylandstats/issues/new?template=feature.md
+
+Thank you.

.github/ISSUE_TEMPLATES/bug.md

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+* PyLandStats version:
+* Python version:
+* Operating System:
+
+### Description
+
+Describe what you were trying to get done.
+Tell us what happened, what went wrong, and what you expected to happen.
+
+### What I Did
+
+```
+Paste the command(s) you ran and the output.
+If there was a crash, please include the traceback here.
+```

.github/ISSUE_TEMPLATES/feature.md

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+### Description
+
+Describe your feature request

CONTRIBUTING.md

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+# Contributing
+
+Contributions are always greatly appreciated and credit will always be given.
+
+## Types of contributions
+
+### Report bugs
+
+Report bugs at https://github.com/martibosch/pylandstats/issues.
+
+If you are reporting a bug, please include:
+
+* Your operating system name and version.
+* Any details about your local setup that might be helpful in troubleshooting.
+* Detailed steps to reproduce the bug.
+
+### Fix bugs
+
+Look through the GitHub issues for bugs. Anything tagged with "bug" and "help wanted" is open to whoever wants to implement it.
+
+### Implement features
+
+Look through the GitHub issues for features. Anything tagged with "enhancement" and "help wanted" is open to whoever wants to implement it.
+
+## Pull request guidelines
+
+Before you submit a pull request, check that it meets these guidelines:
+
+1. The pull request should include tests.
+2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.md.
+3. The pull request should work for Python 2.7 and 3.6, as well as for PyPy. Check https://travis-ci.org/martibosch/pylandstats/pull_requests and make sure that the tests pass for all supported Python versions.