Add GitHub issues and PR templates (#340)

Author: yahavi

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Build info extractors 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**
+- Extractor 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/gradle_bug_report.md

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+---
+name: Gradle Artifactory plugin bug report
+about: Create a report to help us improve
+title: ''
+labels: gradle 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**
+- Gradle Artifactory plugin version:
+- Operating system:
+- Artifactory Version:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/maven_bug_report.md

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+---
+name: Maven Artifactory plugin bug report
+about: Create a report to help us improve
+title: ''
+labels: maven 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**
+- Maven Artifactory plugin version: 
+- Operating system:
+- Artifactory Version:
+
+**Additional context**
+Add any other context about the problem 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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+- [ ] I signed [JFrog's CLA](https://secure.echosign.com/public/hostedForm?formid=5IYKLZ2RXB543N).
+- [ ] All [tests](https://ci.appveyor.com/project/jfrog-ecosystem/build-info) passed. If this feature is not already covered by the tests, I added new tests.
+-----