This is probably the most underrated feature of Todoist. It's super simple, and you get the option of either a URL to copy and paste, or a .CSV file for your personal records.
Here's a quick example.
Step 1: Click on your project on the left-side menu to open it in the main window.
Step 2: In the upper-right corner, click the wrench/pencil icon to open the task actions menu
Step 3: Click "Export as a template (CSV)"
Step 4: Click "Export as shareable URL"
Step 5: Copy the URL
Step 6: Paste the URL to share :)
Step 7: Post to TodoTemplates.com