Introduces templates for GH issues and PRs

.github/ISSUE_TEMPLATE.md

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+<!--
+Thanks for interest in Arquillian Project. What kind of issue would like you to raise?
+
+Question
+
+Please ask questions about how to use something, or to understand why something isn't
+working as you expect it to, on Stack Overflow using the arquillian tag. Alternatively you
+can go to our forum under jboss.org domain https://developer.jboss.org/en/arquillian
+
+Bug report / Enhancement
+
+Please follow template provided below
+
+YOU CAN DELETE THIS TEXT BEFORE SUBMITTING THE ISSUE
+-->
+
+##### Issue Overview
+
+Tell us briefly what the problem is about.
+
+##### Expected Behaviour
+
+##### Current Behaviour
+
+##### Steps To Reproduce
+1. [step 1]
+2. [step 2]
+
+##### Additional Information
+
+Anything relevant to help us resolving the problem. For example if you are using `mvn` you can share output for `mvn --version` as well as dependencies in use `mvn dependency:tree`. OS as well as JDK version would be helpful too.
+
+For long outputs such as stacktraces please use HTML5 `<details>`
+
+```
+<details>
+ <summary>$mvn --version</summary>
+ Maven home: /usr/share/maven/latest
+ Java version: 1.7.0_79, vendor: Oracle Corporation
+ Java home: /usr/java/jdk1.7.0_79/jre
+ Default locale: en_US, platform encoding: UTF-8
+ OS name: "linux", version: "4.7.7-200.fc24.x86_64", arch: "amd64", family: "unix"
+</details>
+```

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- 
+Many thanks for contributing to Arquillian! Together we can make the testing world better.
+
+Please tell us what this PR brings following the template we provided. 
+And don't forget to link to the issue (or create one if there is none).
+
+If you are still working on the change please prefix this pull request title with "WIP"
+
+YOU CAN DELETE THIS COMMENT :)
+-->
+
+#### Short description of what this resolves:
+
+
+#### Changes proposed in this pull request:
+
+-
+-
+-
+
+
+**Fixes**: #