Add issue templates (#1263)

* Add issue template

pgjdbc/ISSUE_TEMPLATE.md

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+**I'm submitting a ...**
+
+  <!--- What kind of an issue is this? Put an `x` in all the boxes that apply: -->
+    - [ ] bug report
+    - [ ] feature request
+
+
+**Describe the issue**
+A clear and concise description of what the issue is.
+
+**Java Version**
+
+**OS Version**
+
+**PostgreSQL Version**
+
+**To Reproduce**
+Steps to reproduce the behaviour:
+
+**Expected behaviour**
+A clear and concise description of what you expected to happen.
+And what actually happens
+
+**Logs**
+If possible PostgreSQL logs surrounding the occurrence of the issue
+Additionally logs from the driver can be obtained adding
+```java
+loggerLevel=TRACE&loggerFile=pgjdbc-trace.log 
+```
+to the connection string

pgjdbc/pull_request_template.md

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+### All Submissions:
+
+* [ ] Have you followed the guidelines in our [Contributing](CONTRIBUTING.md) document?
+* [ ] Have you checked to ensure there aren't other open [Pull Requests](../../pulls) for the same update/change?
+
+<!-- You can erase any parts of this template not applicable to your Pull Request. -->
+
+### New Feature Submissions:
+
+1. [ ] Does your submission pass tests?
+2. [ ] Does mvn checkstyle:check pass ?
+
+### Changes to Existing Features:
+
+* [ ] Does this break existing behaviour? If so please explain.
+* [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
+* [ ] Have you written new tests for your core changes, as applicable?
+* [ ] Have you successfully run tests with your changes locally?