PR template and changelog (#1910)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

.github/pull_request_template.md

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+# Contribution checklist
+
+## Brief description
+
+## Checklist
+
+[ ] - Does the code work? Check whether function and logic are correct.
+[ ] - Does Changelog.md is updated with changes?
+[ ] - Does the translations are up to date?
+[ ] - Does it well tested?
+[ ] - - Tested for Chrome.
+[ ] - - Tested for Safari.
+[ ] - Go through the changed code looking for typos, TODOs, commented LOCs, debugging pieces of code, etc.
+[ ] - Rebase your branch onto master and upstream branch
+[ ] - Is there any redundant or duplicate code?
+[ ] - Are required links are linked to PR?
+[ ] - Does new code is well documented ?
+
+## Related issues
+
+_TODO_ A list of closed updated issues

changelog.md

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+# Changelog
+
+## 0.6.22
+
+Platform:
+
+- Fix popup window layouts
+- Fix table two loading spinners
+- Improve full text search performance
+- Updare reminders layout
+- Settings for Attributes
+- Enumeration custom properties
+- Tags/Skills popup fixes. (Sort by usage/limits/fixes.)
+- Attachments:
+  - Description field and context menu editor for it
+  - Allow mark attachments as important
+- Fix resize glitch
+
+Chunter:
+
+- Jump to date functionality
+
+Tracker:
+
+- Parent issues in new Issue dialog.
+- Fix copy to clipboard
+
+HR:
+
+- Vacancies filters
+- Applications support labels
+- Archived vacancy could be opened/edited.
+- Vacancy now could be extended with custom attributes.
+
+Board:
+
+- Update actions
+- Fix cover presenter
+- Check list items D&D
+
+## 0.6.21
+
+Platform:
+
+- Contact filters
+- Full text search improvments
+- Custom fields
+
+Board:
+
+- Convert checklist to to card
+- Card cover suport
+
+## 0.6.20
+
+Platform:
+
+- Chanell editor fixes
+- Update edit states layout.
+- Homepage contact information added
+- Filter bar fixes
+
+HR:
+
+- Improve Vacancy creation
+
+Board:
+
+- Card layout update
+
+## 0.6.19
+
+Platform:
+
+- Table filters support.
+- Number/String editor layout on side edit panel update
+- Tag filters
+- Redesign comment input field + formatting
+- Allow to set particular date for reminder
+- Collection presenters update
+- Update EditStates/Document Viewer
+- Fix telegram messages display
+- Invite workspace
+- Activity layout fixes
+
+HR:
+
+- Skill filters
+- Vacancy creation fixes, chained dialogs.
+
+Board:
+
+- Checkist assignee support
+- Add confirmation for checlist delete
+- Table view for cards
+
+Tracker:
+
+- Basic Projects support
+- Edit mode for issues
+
+Chunter:
+
+- Convert direct messages to channel
+
+## 0.6.18
+
+Platform:
+
+- Edit channel panel update
+- Table customization support
+- Focus and Keyboard management (Ctrl+K, Command + K)
+
+HR:
+
+- Review redesign
+
+Board:
+
+- Add panel with text editor
+- Fix adding several cards
+
+Chunter:
+
+- User status support