Add issues and PR templates (#301)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐞 Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Versions**
+- Artifactory Java Client version: 
+- Operating system:
+- Artifactory Version:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: ⭐️ Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like to see**
+A clear and concise description of the new feature.
+
+**Describe alternatives you've considered**
+If applicable, a clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: ❓ Question
+about: Ask a question
+title: ''
+labels: question
+assignees: ''
+
+---

.github/PULL_REQUEST_TEMPLATE.md

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+- [ ] All [tests](https://github.com/jfrog/artifactory-client-java#building-and-testing-the-sources) passed. If this feature is not already covered by the tests, I added new tests.
+- [ ] This pull request is on the dev branch.
+-----