Create feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: feature request
+about: suggested feature
+title: ''
+labels: feature request 
+assignees: ''
+---
+
+For feature proposals that require additional research, include:
+* Proposal and background.
+* Motivation of why the feature is interesting from reserach perspective and why it will be useful for the users.
+* Short outline of experiments, and description of necessary sub components (e.g. data curation, training, evaluation), if needed.
+* Related literature or list of references that may be useful in evaluating the reserach proposal.
+
+We will use github issues to the discuss the proposal. Based on our discussions, the contributor(s) will proceed to implement the feature and will provide guidance/help, as needed. 
+Once we receive the PRs, we will review them and merge them after we perform necessary verificaiton and fixing any bugs.
+