Add issues templates

Allow automatic label assignment from external reporters, fix #81

.github/ISSUE_TEMPLATE/crash-report.md

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+---
+name: Crash report
+about: The renderer crashed. Let us know
+title: ''
+labels: bug, crash
+assignees: ''
+
+---
+
+Note that this is only for Vulkan/Ray tracing renderer. Prior to submitting anything here make sure that the game does not crash with native GL renderer (`-ref gl`).
+
+**To Reproduce**
+1. Map name or attached save file
+2. Actions to perform (e.g. go to that room and do this; screenshots appreciated)
+
+**Artifacts**
+E.g. attach last few lines of logs (it may be an assert that's informative).
+
+**Moar context:**
+ - Commit hash of the build
+ - OS
+ - GPU vendor and model
+ - Driver version

.github/ISSUE_TEMPLATE/visual-glitches-report.md

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+---
+name: Visual glitches report
+about: Something doesn't look right
+title: ''
+labels: bug, ray tracing, visual bug
+assignees: ''
+
+---
+
+Note that:
+- this is only for Vulkan/Ray tracing renderer. Prior to submitting anything here make sure that the game looks correct with native GL renderer (`-ref gl`).
+- the renderer is WIP so there are way too many known visual bugs. Make sure to search issues first for it is very likely that we already know about it.
+- Traditional rasterizer is not being actively maintained, so visual glitches in that won't be addressed for a while (unless they stall rt renderer progress).
+
+**To reproduce**
+1. Map name or attached save file
+2. Steps to do (e.g. go to a specific room and perform some action)
+
+**Screenshots**
+1. The thing that looks wrong
+2. How it's supposed to look, e.g.:
+  - screenshot from the same angle made using vanilla GL renderer
+  - screenshot from a production ready PBR/RT renderer of a similar scene with similar materials and lighting parameters.
+
+**Moar context**
+- Commit hash
+- OS
+- GPU vendor and model
+- Driver version