Create README

addons/insignia/README

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+## Rules for insignia:
+- [x] No real people or identifiable information
+- [x] A defined border.
+- [x] Should visually approximate an insignia.
+- [x] Production of the patch should be reasonably.
+     - [x] Colour count.
+     - [x] Details.
+- [x] `png` filetype.
+- [x] Use a valid image dimensions in `pixels`:
+  - 128x128
+  - 256x256
+  - 512x512
+
+------------
+#### Examples of valid insignia are provided as a guideline.
+[![nord](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/players/l_nord.png?raw=true "nord")](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/players/l_nord.png?raw=true "nord")
+[![javelin](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/respect/st_javelin.png?raw=true "javelin")](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/respect/st_javelin.png?raw=true "javelin")
+[![dev_team](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/scripted/dev_team.png?raw=true "dev_team")](https://github.com/Walthzer/WFAR/blob/main/addons/insignia/scripted/dev_team.png?raw=true "dev_team")