Add RFC template

.github/ISSUE_TEMPLATE/RFC_report.md

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+---
+name: RFC template
+about: request for comments
+title: "[RFC]"
+labels: ''
+assignees: ''
+
+---
+
+<!--- Provide a general summary of the RFC in the Title above -->
+- Feature Name: (fill me in with a unique ident, `my_awesome_feature`)
+- Start Date: (fill me in with today's date, YYYY-MM-DD)
+
+# Summary
+[summary]: #summary
+
+One paragraph explanation of the feature.
+
+# Motivation
+[motivation]: #motivation
+
+Why are we doing this? What use cases does it support? What is the expected outcome?
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+Explain the proposal as if it was already included in the Occlum and you were teaching it to another Occlum user. That generally means:
+
+- Introducing new named concepts.
+- Explaining the feature largely in terms of examples.
+- If applicable, provide sample error messages, deprecation warnings, or migration guidance.
+- If applicable, describe the differences between teaching this to existing Occlum users and new Occlum users.
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+This is the technical portion of the RFC. Explain the design in sufficient detail that:
+
+- Its interaction with other features is clear.
+- It is reasonably clear how the feature would be implemented.
+- Corner cases are dissected by example.
+
+The section should return to the examples given in the previous section, and explain more fully how the detailed proposal makes those examples work.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+Why should we *not* do this?
+
+# Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+- Why is this design the best in the space of possible designs?
+- What other designs have been considered and what is the rationale for not choosing them?
+- What is the impact of not doing this?
+
+# Prior art
+[prior-art]: #prior-art
+
+Discuss prior art, both the good and the bad, in relation to this proposal.
+
+# Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
+- What parts of the design do you expect to resolve through the RFC process before this gets merged?
+- What parts of the design do you expect to resolve through the implementation of this feature before stabilization?
+- What related issues do you consider out of scope for this RFC that could be addressed in the future independently of the solution that comes out of this RFC?
+
+# Future possibilities
+[future-possibilities]: #future-possibilities
+
+Think about what the natural extension and evolution of your proposal would
+be and how it would affect the Occlum as a whole in a holistic way. Try to 
+use this section as a tool to more fully consider all possible interactions 
+with the project in your proposal. Also consider how this all fits into the 
+roadmap for the project and of the relevant sub-team.
+
+This is also a good place to "dump ideas", if they are out of scope for the
+RFC you are writing but otherwise related.
+
+If you have tried and cannot think of any future possibilities,
+you may simply state that you cannot think of anything.
+
+Note that having something written down in the future-possibilities section
+is not a reason to accept the current or a future RFC; such notes should be
+in the section on motivation or rationale in this or subsequent RFCs.
+The section merely provides additional information.