Add task checklists

README.md

@@ -253,6 +253,7 @@ or to cover other possible outputs.
 - [ ] Write two test scenarios for "see motivation message" feature
 - [ ] Write two test scenarios for "mark a todo item" feature
 - [ ] Write the required "glue" code to support the new test scenarios
+- [ ] Summarise the whole process and write them in a `summary.md`. Write an analysis of what you did and what you learned from this exercise. Please provide screenshot for each test scenario
 
 > Note: You are allowed to modify the production code (i.e. the `src/main/java` directory) to make your test code can obtain the reference to the UI elements in the page.
 > For example, you can add a new HTML attribute, CSS class, or CSS id to an element in the page to make it easier to be located.
@@ -260,8 +261,7 @@ or to cover other possible outputs.
 ### Additional Tasks
 
 - [ ] Maintain code coverage greater than or equal to 97%
-
-TBD.
+- [ ] Implement an error handling when posting an empty todo item. Create a test scenario for this error-handling
 
 > Outline:
 > - Gherkin format (Given-When-Then) as executable scenarios