Copied OpenSearch repository template files.

Signed-off-by: Shephali Mittal <shephalm@amazon.com>

.github/ISSUE_TEMPLATE/BUG_TEMPLATE.md

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+---
+name: 🐛 Bug report
+about: Create a report to help us improve
+title: '[BUG]'
+labels: 'bug, untriaged'
+assignees: ''
+---
+
+**What is the bug?**
+A clear and concise description of the bug.
+
+**How can one reproduce the bug?**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**What is the expected behavior?**
+A clear and concise description of what you expected to happen.
+
+**What is your host/environment?**
+ - OS: [e.g. iOS]
+ - Version [e.g. 22]
+ - Plugins
+
+**Do you have any screenshots?**
+If applicable, add screenshots to help explain your problem.
+
+**Do you have any additional context?**
+Add any other context about the problem.

.github/ISSUE_TEMPLATE/FEATURE_REQUEST_TEMPLATE.md

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+---
+name: 🎆 Feature request
+about: Request a feature in this project
+title: '[FEATURE]'
+labels: enhancement
+assignees: ''
+---
+**Is your feature request related to a problem?**
+A clear and concise description of what the problem is, e.g. _I'm always frustrated when [...]_
+
+**What solution would you like?**
+A clear and concise description of what you want to happen.
+
+**What alternatives have you considered?**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Do you have any additional context?**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/PROPOSAL_TEMPLATE.md

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+---
+name: 💭 Proposal
+about: Suggest an idea for a specific feature you wish to propose to the community for comment
+title: '[PROPOSAL]'
+labels: proposal
+assignees: ''
+---
+## What kind of business use case are you trying to solve? What are your requirements?
+A clear and concise description of the business problem, e.g. _My customers are asking for [...]_
+
+**What is the problem? What is preventing you from meeting the requirements?**
+Describe what impact this problem has for lack of a solution.
+
+**What are you proposing? What do you suggest we do to solve the problem or improve the existing situation?**
+Describe your proposed solution. It's OK if you don't have one.
+
+**What are your assumptions or prerequisites?**
+Describe any assumptions you may be making that would limit the scope of this proposal.
+
+**What are remaining open questions?**
+List questions that may need to be answered before proceeding with an implementation.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: OpenSearch Community Support
+    url: https://discuss.opendistrocommunity.dev/
+    about: Please ask and answer questions here.
+  - name: AWS/Amazon Security
+    url: https://aws.amazon.com/security/vulnerability-reporting/
+    about: Please report security vulnerabilities here.