todo.sh: add page (#10757)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/todo.sh.md

@@ -0,0 +1,28 @@
+# todo.sh
+
+> Simple and extensible shell script for managing your `todo.txt` file.
+> More information: <https://github.com/todotxt/todo.txt-cli>.
+
+- List every item:
+
+`todo.sh ls`
+
+- Add an item with project and context tags:
+
+`todo.sh add '{{description}} +{{project}} @{{context}}'`
+
+- Mark an item as [do]ne:
+
+`todo.sh do {{item_no}}`
+
+- Remove an item:
+
+`todo.sh rm {{item_no}}`
+
+- Set an item's [pri]ority (A-Z):
+
+`todo.sh pri {{item_no}} {{priority}}`
+
+- Replace an item:
+
+`todo.sh replace {{item_no}} '{{new_description}}'`