feat(misc/assets): Add Hangar branding guidelines

docs/misc/assets.md

@@ -37,6 +37,28 @@ You may not:
 
 ![PaperMC logomark](papermc-logomark-512.png)
 
+## Hangar
+
+You may:
+
+- Use the Hangar logomark to represent the project in blogposts and other places in order to bring
+  attention to the project.
+- Use the Hangar logomark to link to the project's Hangar page.
+- Crop out extra transparent canvas space behind the Hangar logomark, so it fits better next to
+  other content.
+
+You may not:
+
+- Alter any of the colors used in the Hangar logomark.
+- Change the dimensions of the Hangar logomark.
+- Create modified versions of the Hangar logomark or derivative works of it.
+- Add your own project images or branding to the Hangar logomark.
+- Claim the logomark as your own work or use it as a representation of your own projects.
+- Sell the Hangar logomark on its own or as part of other products without explicit permission.
+- Alter the transparency of any elements within the Hangar logomark.
+
+![Hangar logomark](hangar-logomark-512.png)
+
 ## Velocity
 
 Please do not edit, recolor, rearrange, or distort the Velocity logo. Resizing the