Add community nomination issue template

.github/ISSUE_TEMPLATE/community-nomination.md

+---
+name: Community Nomination
+about: Use this template to Nominate someone for a community seat
+title: 'Nomination: [Samantha Carter]'
+labels: community-nomination
+assignees: ''
+
+---
+
+# Nominee
+Name:  
+GitHub Handle: @
+Organization:
+Employer:  
+Bio:
+
+## Nominator
+Name:  
+Organization:  
+Employer: