add a snippet to the issue templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -4,11 +4,18 @@ about: Create a report to help us improve
 title: ''
 labels: bug
 assignees: ''
-
 ---
 
+<!-- 
+DO NOT CREATE A TOKEN LISTING REQUEST IN THIS REPOSITORY.
+YOUR ISSUE WILL BE DELETED. 
+SEE https://github.com/Uniswap/default-token-list#adding-a-token
+
+IF YOU NEED SUPPORT, JOIN THE DISCORD: https://discord.com/invite/EwFs3Pp
+-->
+
 **Bug Description**
-A clear and concise description of what the bug is.
+A clear and concise description of the bug.
 
 **Steps to Reproduce**
 1. Go to ...

.github/ISSUE_TEMPLATE/feature-request.md

@@ -4,9 +4,16 @@ about: Suggest an idea for this project
 title: ''
 labels: ''
 assignees: ''
-
 ---
 
+<!-- 
+DO NOT CREATE A TOKEN LISTING REQUEST IN THIS REPOSITORY.
+YOUR ISSUE WILL BE DELETED. 
+SEE https://github.com/Uniswap/default-token-list#adding-a-token
+
+IF YOU NEED SUPPORT, JOIN THE DISCORD: https://discord.com/invite/EwFs3Pp
+-->
+
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 

.github/ISSUE_TEMPLATE/something-else.md

@@ -4,7 +4,15 @@ about: Tell us something else
 title: ''
 labels: ''
 assignees: ''
-
 ---
 
+<!-- 
+DO NOT CREATE A TOKEN LISTING REQUEST IN THIS REPOSITORY.
+YOUR ISSUE WILL BE DELETED. 
+SEE https://github.com/Uniswap/default-token-list#adding-a-token
+
+IF YOU NEED SUPPORT, JOIN THE DISCORD: https://discord.com/invite/EwFs3Pp
+-->
+
+