docs: add issue templates

.github/ISSUE_TEMPLATE/01_bug_report.md

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+---
+name: Bug report
+about: Something isn’t working as expected
+---
+
+## Steps to reproduce
+
+<!-- Describe the steps with which you can reproduce the issue. -->
+
+## Expected result
+
+<!-- Describe what you expected to happen -->
+
+## Actual result
+
+<!-- Describe what actually happened -->
+
+---
+
+- Balatrolator URL: —<!-- If applicable, provide the Balatrolator share URL -->

.github/ISSUE_TEMPLATE/02_feature_request.md

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+---
+name: Feature request
+about: Something is missing
+---
+
+## Description
+
+<!-- Describe the feature -->
+
+## Motivation
+
+<!-- Describe why you think this should be added to Balatrolator -->