Update user guide

Author: ampan98

docs/README.md

@@ -2,19 +2,171 @@
 
 ## Features 
 
-### Feature 1 
-Description of feature.
+### Add tasks
+You can add a task to the task list.
+Duke recognises 3 types of tasks.
+* `Todo` - A task with no time requirement
+* `Deadline` - A task with a deadline
+* `Event` - A task with a specified time
+
+### List tasks
+You can display the task list. Tasks will be shown
+in the order they were added.
+
+### Mark tasks as done
+You can mark a task as done. Note that done tasks will
+not be automatically deleted. Additionally, you will
+not be able to undo this action.
+
+### Delete task
+You can delete a task from the task list.
+
+### Find task
+You can search for a task containing a given keyword.
+
+### Exit
+You can exit the program.
+
+### Auto save
+The task list will be automatically saved after every change
+and will persist through subsequent sessions.
 
 ## Usage
 
-### `Keyword` - Describe action
+### `todo` - Add a Todo task
 
-Describe action and its outcome.
+Adds a task with name as provided.
 
 Example of usage: 
 
-`keyword (optional arguments)`
+`todo (name)`\
+`t (name)`
+
+Expected outcome:
+
+`Task added:`\
+`[T][ ] (name)`\
+`Total tasks in list: (number of tasks)`
+
+### `deadline` - Add a Deadline task
+
+Adds a task with name and date as provided.
+The date should be in `yyyy-MM-dd` format.
+
+Example of usage:
+
+`deadline (name) /by (date)`\
+`d (name) /by (date)`
+
+Expected outcome:
+
+`Task added:`\
+`[D][ ] (name) (by: (date))`\
+`Total tasks in list: (number of tasks)`
+
+### `event` - Add an Event task
+
+Adds a task with name and date as provided.
+The date should be in `yyyy-MM-dd` format.
+
+Example of usage:
+
+`event (name) /at (date)`\
+`e (name) /at (date)`
+
+Expected outcome:
+
+`Task added:`\
+`[E][ ] (name) (at: (date))`\
+`Total tasks in list: (number of tasks)`
+
+### `list` - Show the task list
+
+Shows the saved list of tasks.
+
+Example of usage:
+
+`list`\
+`l`
+
+Expected outcome:
+
+`Tasks in list:`\
+`1.(task details)`\
+`...`
+
+### `done` - Mark a task as done
+
+Marks as done the task at the provided numerical index of the list.
+This number corresponds to the one shown by `list`.
+
+Example of usage:
+
+`done (index)`\
+`do (index)`
+
+Expected outcome:
+
+`Successfully marked as done:`\
+`[(task type)][X] (task description)`
+
+### `delete` - Delete a task
+
+Deletes the task at the provided numerical index of the list.
+This number corresponds to the one shown by `list`.
+
+Example of usage:
+
+`delete (index)`\
+`del (index)`
+
+Expected outcome:
+
+`Successfully removed:`\
+`(task details)`\
+`Total tasks in list: (number of tasks)`
+
+### `find` - Find a task
+
+Searches for all tasks containing the provided keyword.
+This will only consider the first provided keyword.
+
+Example of usage:
+
+`find (keyword)`\
+`f (keyword)`
+
+Expected outcome:
+
+`Matching tasks in list:`\
+`1.(task details)`\
+`...`
+
+### `delete` - Delete a task
+
+Deletes the task at the provided numerical index of the list.
+This number corresponds to the one shown by `list`.
+
+Example of usage:
+
+`delete (index)`\
+`del (index)`
+
+Expected outcome:
+
+`Successfully removed:`\
+`(task details)`\
+`Total tasks in list: (number of tasks)`
+
+### `bye` - Exit the program
+
+Closes the program immediately.
+
+Example of usage:
+
+`bye`\
+`b`
 
 Expected outcome:
 
-`outcome`
+>The program closes.