chore: add pull request template (#271)

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please refer to this [guide](https://github.com/regentmarkets/flutter-deriv-packages/blob/master/.github/GIT_RULES.md#pr-rules) for any confusion while creating the PR -->
+
+**Clickup link:** <!-- Add your clickup link here, Remove this line if this PR is not for a task -->
+**Fixes issue:** #<!-- Issue number here, Remove this line if this PR isn't related to any issue -->
+
+This PR contains the following changes:
+
+<!-- Provide a description or list of changes -->
+
+- [ ] ✨ New feature (non-breaking change which adds functionality)
+- [ ] 🛠️ Bug fix (non-breaking change which fixes an issue)
+- [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] 🧹 Code refactor
+- [ ] ✅ Build configuration change
+- [ ] 📝 Documentation
+- [ ] 🗑️ Chore
+
+### Developers Note (Optional)
+
+<!-- REMOVE THIS SECTION IF IT IS NOT NEEDED.>
+
+<!-- Add the reason of making changes in this approach so that it will be helpful to reviewers while reviewing it. -->
+
+## Pre-launch Checklist (For PR creator)
+
+As a creator of this PR:
+
+<!-- Put an `x` in all the boxes that apply ([x]) -->
+
+- [ ] ✍️ I have included clickup id and package/app_name in the PR title. <!-- Find the guide [here](https://github.com/regentmarkets/flutter-deriv-packages/blob/master/.github/GIT_RULES.md#pr-rules) -->
+- [ ] 👁️ I have gone through the code and removed any temporary changes (commented lines, prints, debug statements etc.).
+- [ ] ⚒️ I have fixed any errors/warnings shown by the analyzer/linter.
+- [ ] 📝 I have added documentation, comments and logging wherever required.
+- [ ] 🧪 I have added necessary tests for these changes.
+- [ ] 🔎 I have ensured all existing tests are passing.
+
+## Reviewers
+
+<!-- Tag the reviewers of this PR -->
+
+## Pre-launch Checklist (For Reviewers)
+
+As a reviewer I ensure that:
+
+- [ ] ✴️ This PR follows the standard PR template.
+- [ ] 🪩 The information in this PR properly reflects the code changes.
+- [ ] 🧪 All the necessary tests for this PR's are passing.
+
+## Pre-launch Checklist (For QA)
+
+- [ ] 👌 It passes the acceptance criteria.
+
+## Pre-launch Checklist (For Maintainer)
+
+- [ ] [MAINTAINER_NAME] I make sure this PR fulfills its purpose.