Add documentation for creating work items via URL

docs/core-concepts/issues/work-item-url.mdx

@@ -0,0 +1,169 @@
+---
+title: Create work items via URL
+description: Use a URL to trigger the creation of a new work item in Plane and pre-fill fields using query parameters.
+---
+
+# Create work items via URL
+
+Plane provides a special URL that triggers the creation of a new work item in any browser. You can add query parameters to this URL to pre-fill work item fields, making it easy to create work items from external tools, bookmarks, or shared links.
+
+## Base URL
+
+**For Plane Cloud**  
+`https://app.plane.so/work-items/new`.
+
+For self-hosted instances, replace `app.plane.so` with your domain, e.g., `https://plane.yourdomain.com/work-items/new`.
+
+When you visit this URL, Plane authenticates you, redirects to your last active workspace, and opens the work item creation modal. Any query parameters you include will pre-fill the corresponding fields.
+
+## Build a URL with parameters
+
+Start with the base URL, add `?`, then append parameters in `name=value` format. Separate multiple parameters with `&`.
+```bash
+https://app.plane.so/work-items/new?title=Fix+bug&priority=high&assignee=me
+```
+
+A few formatting rules:
+
+- Use `+` or `%20` for spaces in text values.
+- URL-encode special characters in descriptions.
+- Separate multiple values (like assignees) with commas.
+
+## Query parameters reference
+
+### workspace
+
+Overrides the default behavior of redirecting to your last active workspace. Pass a workspace slug to land in a specific workspace instead.
+
+```
+https://app.plane.so/work-items/new?workspace=plane
+```
+
+### title
+
+Sets the work item title. Replace spaces with `+` or `%20`.
+
+```
+https://app.plane.so/work-items/new?title=Fix+login+bug
+```
+
+```
+https://app.plane.so/work-items/new?title=Implement%20new%20feature
+```
+
+### description
+
+Sets the work item description. For anything beyond simple text, URL-encode the content to handle special characters and line breaks.
+
+```
+https://app.plane.so/work-items/new?description=This+is+a+bug+description
+```
+
+Combined with a title:
+
+```
+https://app.plane.so/work-items/new?title=Bug+Report&description=Steps+to+reproduce
+```
+
+### project
+
+Assigns the work item to a project. You can use either the project identifier (the short code like `WEB` or `MOBILE`) or the project's UUID.
+
+```
+https://app.plane.so/work-items/new?project=WEB
+```
+
+```
+https://app.plane.so/work-items/new?project=MOBILE&title=New+feature
+```
+
+### priority
+
+Sets the priority level. Accepts `urgent`, `high`, `medium`, `low`, or `none`. Values are case-insensitive, so `High`, `HIGH`, and `high` all work.
+
+```
+https://app.plane.so/work-items/new?priority=urgent
+```
+
+```
+https://app.plane.so/work-items/new?priority=high&title=Critical+fix
+```
+
+```
+https://app.plane.so/work-items/new?priority=Medium
+```
+
+### assignee
+
+Assigns one or more team members to the work item. You can specify assignees by UUID, display name, or use `me` to assign to whoever opens the URL. For names with spaces, use `+` or `%20`. To assign multiple people, separate values with commas.
+
+Assign to yourself:
+
+```
+https://app.plane.so/work-items/new?assignee=me
+```
+
+Assign by display name:
+
+```
+https://app.plane.so/work-items/new?assignee=john
+```
+
+Assign by full name:
+
+```
+https://app.plane.so/work-items/new?assignee=Erin+Baker
+```
+
+Assign multiple people:
+
+```
+https://app.plane.so/work-items/new?assignee=me,john,jane
+```
+
+### start_date
+
+Sets the start date. Use `YYYY-MM-DD` or ISO 8601 format for consistency, though any format that JavaScript's `Date` can parse will work.
+
+```
+https://app.plane.so/work-items/new?start_date=2024-03-15
+```
+
+### due_date
+
+Sets the due date (also called target date). Same format rules as `start_date`.
+
+```
+https://app.plane.so/work-items/new?due_date=2024-03-30
+```
+
+## Examples
+
+**Bug report with title and description:**
+
+```
+https://app.plane.so/work-items/new?title=Login+button+not+working&description=Users+cannot+click+the+login+button+on+mobile
+```
+
+**High-priority task assigned to yourself:**
+
+```
+https://app.plane.so/work-items/new?project=WEB&priority=high&assignee=me&title=Fix+authentication+bug
+```
+
+**Fully populated work item:**
+
+```
+https://app.plane.so/work-items/new?title=Implement+dark+mode&description=Add+dark+mode+support+to+the+dashboard&project=FRONTEND&priority=medium&assignee=me,john&start_date=2024-03-15&due_date=2024-03-30
+```
+
+## Things to know
+
+- **Authentication required**  
+Users must be logged in. If they're not, Plane redirects them to sign in first, then continues to the work item modal.
+- **Invalid values are ignored**   
+If a project identifier or display name doesn't match an existing record, Plane skips that parameter and processes the rest.
+- **Case doesn't matter**   
+Values like priority and project identifier are case-insensitive.
+- **Users can still edit**   
+Pre-filled values aren't locked. After the modal opens, users can change any field before creating the work item.

sidebars.ts

@@ -120,6 +120,7 @@ const sidebars: SidebarsConfig = {
           items: [
             "core-concepts/issues/overview",
             "core-concepts/issues/properties",
+            "core-concepts/issues/work-item-url",
             "core-concepts/drafts",
           ],
         },