Update README.md

Author: imckl

README.md

@@ -4,4 +4,10 @@
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 |[![Build status](https://ci.appveyor.com/api/projects/status/iafga7jyodadnmcg?svg=true)](https://ci.appveyor.com/project/imckl/weapononback)|
 #### Description
-- Put/Sheath weapons on back, with custom components.
+1. Put/Sheath weapons on back, with custom components.
+2. Weapon is diplayed via switching weapons.
+3. [Demo here](https://youtu.be/ArKqJMv8ZIE).
+#### Known issues
+1. It seems too much omponents/tints on weapon objects would cause unknown crash(eg: crash when switch to first-person), I've limited up to 3 weapon objects to diplay, and tested only 1-2 players online and works fine. If players encounter more frequent crash related to thia script, please provide detail info.
+2. Currently "attached" position is not fit well on every models.
+3. If you find more issues, feel free to post it.