Added a bug, change and feature template (#716)

Co-authored-by: Andreas Becker <mail@andreasbecker.de>

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: Found a bug? Let us know! 🐛
+labels: bug, unreviewed
+
+---
+
+<!-- Please provide a general summary of the issue in the title above. -->
+
+# Expected behavior
+<!-- Describe here what you have expected to happen -->
+
+# Observed behavior
+<!-- Describe here what happened instead of the expected behavior -->
+
+# Steps to reproduce
+<!-- Tell use all the steps you did so we can reproduce the problem -->
+1. 
+2. 
+3. 
+4.
+
+# Screenshots
+<!-- Add additional screenshots -->
+
+# Your Environment
+
+Please tell us more about your environment
+
+**VeraCrypt version:** <!-- f.e. 1.24-Update7 -->
+
+**Operating system and version:** <!-- f.e. Windows 10 build 19042 -->
+
+**System type:** <!-- f.e. 64-bit -->

.github/ISSUE_TEMPLATE/change.md

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+---
+name: Change
+about: Change or extend functionality that already exists.
+labels: change, unreviewed
+
+---
+
+<!-- Please provide a general summary of your change in the title above. -->
+
+# Current behavior
+<!-- Describe here how it actually works -->
+
+# Desired behavior
+<!-- Describe here the difference from current behavior-->
+
+# Screenshots/Mockup/Designs
+<!-- Add additional screenshots, mockups or design proposals -->
+
+# Additional information
+<!-- Are there any additional requirements? Further ideas, ... -->
+
+# Your Environment
+
+Please tell us more about your environment
+
+**VeraCrypt version:** <!-- f.e. 1.24-Update7 -->
+
+**Operating system and version:** <!-- f.e. Windows 10 build 19042 -->
+
+**System type:** <!-- f.e. 64-bit -->

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature
+about: Add new functionality or suggest an idea to the project.
+labels: feature, unreviewed
+
+---
+
+<!-- Please provide a general summary of your feature in the title above. -->
+
+# Desired behavior
+<!-- Describe here what and why your feature should be added -->
+
+# Screenshots/Mockup/Designs
+<!-- Add additional screenshots, mockups or design proposals -->
+
+# Additional information
+<!-- Are there any additional requirements? Further ideas, ... -->
+
+# Your Environment
+
+Please tell us more about your environment
+
+**VeraCrypt version:** <!-- f.e. 1.24-Update7 -->
+
+**Operating system and version:** <!-- f.e. Windows 10 build 19042 -->
+
+**System type:** <!-- f.e. 64-bit -->