add issue & PR templates

.github/ISSUE_TEMPLATE.md

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+---
+name: Requesting a Feature or Improvement
+about: "For feature requests. Please search for existing issues first. Also see CONTRIBUTING."
+title: ''
+labels: Feedback, Feature, SC-Eng
+assignees: ''
+
+---
+
+## Instructions
+
+Please fill out the template below to the best of your ability and include a label indicating which tool/service you were working with when you encountered the problem.
+
+### Issue To Be Solved
+(Replace This Text: Please present a concise description of the problem to be addressed by this feature request. Please be clear what parts of the problem are considered to be in-scope and out-of-scope.)
+
+### (Optional): Suggest A Solution
+(Replace This Text: A concise description of your preferred solution. Things to address include:
+* Details of the technical implementation
+* Tradeoffs made in design decisions
+* Caveats and considerations for the future
+
+If there are multiple solutions, please present each one separately. Save comparisons for the very end.)
+
+### (Optional): Context
+
+<what are you currently working on that this is blocking?>

.github/PULL_REQUEST_TEMPLATE.md

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+Closes: #???
+
+## Description
+
+<!-- Add a description of the changes that this PR introduces and the files that
+are the most critical to review.
+-->
+
+______
+
+For contributor use:
+
+- [ ] Targeted PR against `master` branch
+- [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
+- [ ] Code follows the [standards mentioned here](https://github.com/onflow/flow-nft/blob/master/CONTRIBUTING.md#styleguides).
+- [ ] Updated relevant documentation 
+- [ ] Re-reviewed `Files changed` in the Github PR explorer
+- [ ] Added appropriate labels 
+<!-- Please follow the below standard to update the version in package.json
+    - Major if there is a new smart contract introduced.
+    - Major if there is a breaking change that is introduced in the existing contract.
+    - Minor if there is a new feature addition within the existing smart contracts.
+    - Patch if there is a non breaking change in the existing smart contracts.
+-->
+- [ ] Update the version in package.json when there is a change in the smart contracts