Update amendment-proposal.md

.github/ISSUE_TEMPLATE/amendment-proposal.md

@@ -6,5 +6,15 @@ labels: ''
 assignees: ''
 
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+# Requestor(s)*
+_(Name of individuals, groups, or organizations that are requesting the amendment. Include relevant affiliations and GitHub user names, as applicable.)_
+
+# Overview of proposal*
+_(Overview description of the amendment(s) requested. Include as much relevant information as possible, such as rationale, purpose, and implementation plans.)_
+
+# Amendment details*
+_(The exact changes proposed. Enter TBD if the details are unknown. This content may evolve as decisions are finalized.)_
+
+# Potential impacts
+_(Identification of applications, standards or other publications that may be effected by the amendment.)_
 
-Introduction to request