Added issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve existing features
+
+---
+
+**Baikal version**: 0.x
+
+**Expected behaviour**:
+
+**Current behaviour**:
+
+**Steps to reproduce**:
+
+1. This
+1. Than that
+1. Then

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request a new feature
+
+---
+
+**Baikal version**: 0.x
+
+<!--
+Try do be as specific as possible. Please not only explain what the feature does, but also how. When your request is about changing or extending the UI, describe what the UI would look like and how the user would interact with it.
+-->
+
+**Problem you are having**:
+
+**Suggested solution**:
+

.github/ISSUE_TEMPLATE/upgrading.md

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+---
+name: Upgrading
+about: When having trouble upgrading Baikal
+
+---
+
+**Baikal version**: 0.x
+
+<!--
+Please fill out the following checklist:
+Replace the empty checkboxes [ ] below with checked ones [x].
+-->
+
+- [ ] I have searched open and closed issues for duplicates
+- [ ] I have installed the release zip, not the source code zip
+- [ ] I have moved the whole, untouched `Specific` folder to the new installation
+
+**Problem**:
+<!-- Please describe the problem you are facing -->