topydo: add page (#5017)

pages/common/topydo.md

@@ -0,0 +1,28 @@
+# topydo
+
+> A todo list application that uses the todo.txt format.
+> More information: <https://github.com/topydo/topydo>.
+
+- Add a todo to a specific project with a given context:
+
+`topydo add "{{todo_message}} +{{project_name}} @{{context_name}}"`
+
+- Add a todo with a due date of tomorrow with a priority of `A`:
+
+`topydo add "(A) {{todo _message}} due:{{1d}}"`
+
+- Add a todo with a due date of friday:
+
+`topydo add "{{todo_message}} due:{{fri}}"`
+
+- Add a non-strict repeating todo (next due = now + rec):
+
+`topydo add "water flowers due:{{mon}} rec:{{1w}}"`
+
+- Add a strict repeating todo (next due = currentdue + rec):
+
+`topydo add "{{todo_message}} due:{{2020-01-01}} rec:{{+1m}}"`
+
+- Revert the last `topydo` command executed:
+
+`topydo revert`