Added GitHub issue templates

Author: korridor

.github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md

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+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Environment
+
+<!-- Are you self-hosting or using the cloud version? -->
+- [ ] Self-hosting
+- [ ] Cloud version
+
+<!-- If you are self-hosting, please provide the following information -->
+- **Version**: <!--- The version of solidtime you are using -->
+- **Did you use our guide? And if yes which one?**: <!--- The guide you used to set up solidtime -->
+
+## Context (Environment)
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Detailed Description
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+## Possible Implementation
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->

.github/ISSUE_TEMPLATE/PULL_REQUEST_TEMPLATE.md

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+This project is early stage. The structure and APIs are still subject to change and not stable.
+Therefore, we do not currently accept any contributions, unless you are a member of the team.
+
+As soon as we feel comfortable enough that the application structure is stable enough, we will open up the project for contributions.
+
+We do accept contributions in the [documentation repository](https://github.com/solidtime-io/docs) f.e. to add new self-hosting guides.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🚀 Feature Request
+    url: https://github.com/solidtime-io/solidtime/discussions/new?category=feature-requests
+    about: Share ideas for new features
+  - name: ❓ Ask a Question
+    url: https://github.com/solidtime-io/solidtime/discussions/new?category=general
+    about: Ask the community for help