add GitHub issue and pull request templates

Author: tofi86

.github/issue_template.md

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+I'm submitting a…
+
+- [x] bug report
+- [ ] feature request
+- [ ] other
+
+**Short description of the issue/suggestion:**
+
+
+
+**Steps to reproduce the issue/enhancement:**
+
+1. [First Step]
+2. [Second Step]
+3. [Other Steps...]
+
+**What is the expected behavior?**
+
+
+
+**What is the current behavior?**
+
+
+
+**Do you have screenshots, GIFs, demos or samples which demonstrate the problem or enhancement?**
+
+![image description](url)
+
+**What is the motivation / use case for changing the behavior?**
+
+
+
+**Please tell us about your environment:**
+
+- Mac OS version:
+- Java version(s):
+
+**Other information** (e.g. related issues, suggestions how to fix, links for us to have context)

.github/pull_request_template.md

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+**Please check if the PullRequest fulfills these requirements:**
+
+(Add x between brackets to check.)
+
+- [ ] I’m making this pull request against the `develop` branch
+- [ ] I’ve updated from the `develop` branch before proposing this pull request
+- [ ] I’ve tested the changes for bug fixes and/or features
+- [ ] I’ve documented new code
+
+**What kind of change does this PR introduce?** (Bug fix, feature, docs update, other)
+
+
+
+**What is the current behavior?** (You can also link to an open issue here)
+
+
+
+**What is the new behavior?**
+
+
+
+**Does this PR introduce a breaking change?** (What changes might users need to make in their application / PList file due to this PR?)
+
+
+
+**Other information:**