docs(github): add issue and pull request templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Something's not working as expected.
+title: ''
+labels: bug
+---
+
+## Description
+
+<!-- Describe the issue that you're seeing. -->
+
+## Expected Behaviour
+
+<!-- What should've happened? -->
+
+## Additional Information
+
+<!-- (Optional) Any additional info that you think might come in handy for debugging. -->

.github/ISSUE_TEMPLATE/epic.md

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+---
+name: Epic
+about: A master issue thread which contains other smaller issues.
+title: ''
+labels: epic
+assignees: zainfathoni
+---
+
+## Overview
+
+<!-- Describe what this epic is all about and how the project could benefit from it. -->
+
+## Definition of Done
+
+<!-- List all the requirements for each issue under this epic to be considered `Done` -->
+
+1. Requirement 1
+2. Requirement 2
+3. Requirement 3
+
+## Current Tasks
+
+<!-- List all the tasks here in markdown checkboxes. We can later spin off these into individual issue threads through the GitHub UI. -->
+
+- [ ] (task 1)
+- [ ] (task 2)
+- [ ] (task 3)

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Propose feature additions to the project.
+title: ''
+labels: enhancement
+---
+
+## Description
+
+<!-- Describe the proposed feature and how the project could benefit from it. -->
+
+## Narrative
+
+<!-- A short introductory section with the following structure: -->
+
+- **As a** <!-- the person or role who will benefit from the feature -->
+- **I want** <!-- the feature -->
+- **so that** <!-- the benefit or value of the feature -->
+
+## Acceptance Criteria
+
+<!-- A description of each specific scenario of the narrative with the following structure: -->
+
+### Scenario 1: <!-- Scenario title -->
+
+- **Given** <!-- the initial context at the beginning of the scenario -->
+- **and** <!-- if more than one clause -->
+- **when** <!-- the event that triggers the scenario -->
+- **then** <!-- the expected outcome -->
+- **and** <!-- if more than one clause -->
+
+## Implementation Model
+
+<!-- (Optional) If available, outline the possible steps to take (e.g. lines of code to change, architectural details, etc.) to implement the feature. -->
+
+### Image previews
+
+<details>
+<summary>Component name</summary>
+
+#### Desktop view
+
+#### Mobile view
+
+</details>
+
+### Code snippets
+
+<details>
+<summary>Component name</summary>
+
+```jsx
+
+```
+
+</details>
+
+## Tasks
+
+<!-- (Optional) List any available tasks for this issue with checkbox lists. -->
+
+- [ ] ...
+- [ ] ...
+- [ ] ...

.github/pull_request_template.md

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+Closes <!-- mention the issue that you're trying to close with this PR -->
+
+## Description
+
+<!-- Describe your implementation plan and approach -->
+
+## Current Tasks
+
+<!-- (Optional) List the tasks you're planning to do in this PR.
+This section is to indicate how much you have been progressing before this PR is ready for review -->
+
+- [ ] (task 1)
+- [ ] (task 2)
+- [ ] (task 3)