Adding some GitHub templates, related to #160

Author: jachym

.github/ISSUE_TEMPLATE.md

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+# Description
+
+# Environment
+
+- operating system:
+- Python version:
+- PyWPS version:
+- source/distribution
+ - [ ] git clone
+ - [ ] Debian
+ - [ ] PyPI
+ - [ ] zip/tar.gz
+ - [ ] other (please specify): 
+- web server
+ - [ ] Apache/mod_wsgi
+ - [ ] CGI
+ - [ ] other (please specify): 
+
+# Steps to Reproduce
+
+# Additional Information

.github/PULL_REQUEST_TEMPLATE.md

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+# Overview
+
+# Related Issue / Discussion
+
+# Additional Information
+
+# Contribution Agreement
+
+(as per https://github.com/geopython/pywps/blob/master/CONTRIBUTING.rst#contributions-and-licensing)
+
+- [ ] I'd like to contribute [feature X|bugfix Y|docs|something else] to PyWPS. I confirm that my contributions to PyWPS will be compatible with the PyWPS license guidelines at the time of contribution.
+- [ ] I have already previously agreed to the PyWPS Contributions and Licensing Guidelines