Add issue templates

This helps users filing issues

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea/improvement for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Problem statement and motivation
+What's not working ideally at the moment? What could we improve and why could this be interesting for users?
+
+## Goal of this feature
+What should the solution be like? A list of high-level behavior/requirement descriptions.
+
+## Approach and next steps
+Anything about ideas/intermediate steps for implementation or further references on that topic

.github/ISSUE_TEMPLATE/general_issue.md

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+---
+name: General issue
+about: Setup, configuration, use cases, bugs, etc.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Problem description**
+A clear and concise description of what the problem is.
+
+
+**Software versions**
+ - **Commit**: What's the output of `git rev-parse HEAD` in the `sick_safevisionary_ros2` and the `sick_safevisionary_base` package?
+ - **OS**: What's the output of `uname -srvm`?
+ - **ROS version**: What's your ROS2 version?
+
+
+**To Reproduce**
+If possible, list the steps to reproduce the behavior.
+
+
+**Expected behavior**
+What did you expect to happen and what happened instead?
+
+
+**Additional context**
+Add anything that you feel is relevant to tackle this issue.