Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve rippled
+title: "[Title with short description] (Version: [rippled version])"
+labels: ''
+assignees: ''
+
+---
+<!-- Please search existing issues to avoid creating duplicates.-->
+
+## Issue Description
+<!--Provide a summary for your issue/bug.-->
+
+## Steps to Reproduce
+<!--List in detail the exact steps to reproduce the unexpected behavior of the software.-->
+
+## Expected Result
+<!--Explain in detail what behavior you expected to happen.-->
+
+## Actual Result
+<!--Explain in detail what behavior actually happened.-->
+
+## Environment
+<!--Please describe your environment setup (such as Ubuntu 18.04 with Boost 1.70).-->
+<!-- If you are using a formal release, please use the version returned by './rippled --version' as the verison number-->
+<!-- If you are working off of develop, please add the git hash via 'git rev-parse HEAD'-->
+
+## Supporting Files
+<!--If you have supporting files such as a log, feel free to post a link here using Github Gist.-->
+<!--Consider adding configuration files with private information removed via Github Gist. -->
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: XRP Ledger Documentation
+    url: https://xrpl.org/
+    about: All things about XRPL
+  - name: General question for the community
+    url: https://forum.xpring.io/c/community/
+    about: Please ask and answer questions here.
+  - name: Security bug bounty program
+    url: https://ripple.com/bug-bounty/
+    about: Please report security-relevant bugs in our software here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature for the rippled project
+title: "[Title with short description] (Version: [rippled version])"
+labels: Feature Request
+assignees: ''
+
+---
+<!-- Please search existing issues to avoid creating duplicates.-->
+
+## Summary
+<!-- Provide a summary to the feature request-->
+
+## Motivation
+<!-- Why do we need this feature?-->
+
+## Solution
+<!-- What is the solution?-->
+
+## Paths Not Taken
+<!-- What other alternatives have been considered?-->