Add ISSUE_TEMPLATES

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: create a bug report
+---
+
+__System info:__ [Include Ethermint commit, operating system name, and other relevant details]
+
+__Steps to reproduce:__
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+__Expected behavior:__ [What you expected to happen]
+
+__Actual behavior:__ [What actually happened]
+
+__Additional info:__ [Include gist of relevant config, logs, etc.]

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Opening a feature request kicks off a discussion
+
+---
+
+__Proposal:__ [Description of the feature]
+
+__Current behavior:__ [What currently happens]
+
+__Desired behavior:__ [What you would like to happen]
+
+__Use case:__ [Why is this important (helps with prioritizing requests)]
+
+Requests may be closed if we're not actively planning to work on them.