Create issue_template.md

.github/issue_template.md

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+---
+name: Issue Template
+about: Template for OpenSHMEM Issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Problem Statement
+
+<!-- Describe the problem solved by this proposal. -->
+
+# Proposed Changes
+
+<!-- Describe the high level idea and proposed changes. -->
+
+# Impact on Implementations
+
+<!-- Describe changes that implementations will be required to make here. -->
+
+# Impact on Users
+
+<!-- Describe the changes that will impact users here. -->
+
+# References and Pull Requests
+
+<!-- References to other pull requests or issues, papers, websites, etc. Please keep this updated. -->