Add github templates

.github/ISSUE_TEMPLATE.md

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+Please, prefix the report title with the language it applies to within brackets, such as *[Java]* or *[Apex]*. If not specific to a language, you can use *[Core]*
+
+**Rule Set:**
+
+**Description:**
+
+**Code Sample demonstrating the issue:**
+
+```
+
+```
+
+**Running PMD through:** *[CLI | Ant | Maven | Gradle | Designer | Other]*
+

.github/PULL_REQUEST_TEMPLATE.md

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+Please, prefix the PR title with the language it applies to within brackets, such as *[Java]* or *[Apex]*. If not specific to a language, you can use *[Core]*
+
+Before submitting a PR, please check that:
+ - [ ] The PR is submitted against `master`. The PMD team will merge back to support branches as needed.
+ - [ ] `mvn test` passes.
+ - [ ] `mvn checkstyle:check` passes. [Check this for more info](https://github.com/pmd/pmd/blob/master/CONTRIBUTING.md#code-style)
+
+**PR Description:**
+