Adding new issue and pull request template (#25)

Signed-off-by: Prakriti <[email protected]>

.github/ISSUE_TEMPLATE.md

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+<!--
+Welcome to the Jaeger project! 👋🎉
+
+- Please search for existing issues to avoid creating duplicate bugs/feature requests.
+- Please be respectful and considerate of others when commenting on issues.
+- Please provide as much information as possible so we all understand the issue.
+- If you only have a question, you may get a faster response by asking in
+    - our chat room https://gitter.im/jaegertracing/Lobby, or
+    - the forum https://groups.google.com/d/forum/jaeger-tracing
+    (but please don't double post)
+-->
+
+## Requirement - what kind of business use case are you trying to solve?
+
+<!-- required section -->
+
+## Problem - what in Jaeger blocks you from solving the requirement?
+
+<!-- required section -->
+<!-- If possible, describe the impact of the problem. -->
+
+## Proposal - what do you suggest to solve the problem or improve the existing situation?
+
+<!-- It's ok if you don't have one. -->
+
+## Any open questions to address
+
+<!-- Questions that should be answered before proceeding with implementation. -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+We appreciate your contribution to the Jaeger project! 👋🎉
+
+Before creating a pull request, please make sure:
+- Your PR is solving one problem
+- You have read the guide for contributing
+  - See https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
+- You signed all your commits (otherwise we won't be able to merge the PR)
+  - See https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md#sign-your-work
+- You added unit tests for the new functionality
+- You mention in the PR description which issue it is addressing, e.g. "Resolves #123"
+-->
+
+## Which problem is this PR solving?
+-
+
+## Short description of the changes
+-