Update User Guide

docs/README.md

@@ -1,14 +1,50 @@
 # User Guide
 
+Nehsik is a CLI-based Personal Assistant ChatBot that helps the user to keep track of their daily tasks
+
 ## Features 
 
-### Feature-ABC
+### Add tasks : `todo`, `deadline`, `event`
+
+Tasks of the following types can be added:
+- **Todo**: Contains task description only
+- **Deadline**: Contains task description and the deadline time
+- **Event**: Contains task description and the duration of the event
+
+Format: `todo TASK_DESCRIPTION` `deadline TASK_DESCRIPTION /by DEADLINE` `event TASK_DESCRIPTION /from START_TIME /to END_TIME`
+
+### List tasks : `list`
+
+Displays all the tasks present in the task list.
+Format: `list`
+
+### Delete task : `delete` 
+
+Deletes the required task based on the task number of the task to be deleted in the latest task list.
+Format: `delete TASK_NUM`
+
+### Mark task : `mark`
+
+Marks the required task as done based on the task number of the task to be marked as done in the latest task list.
+Format: `mark TASK_NUM`
+
+### Unmark task : `unmark`
+
+Marks the required task as not done based on the task number of the task to be marked as not done in the latest task list.
+Format: `unmark TASK_NUM`
+
+### Find task : `find`
 
-Description of the feature.
+Displays the list of matching tasks which contain the keyword in their descriptions.
+Format: `find KEYWORD`
 
-### Feature-XYZ
+### Exit : `bye`
+Displays bye message and exits from the program.
+Format: `bye`
 
-Description of the feature.
+### Saving the data
+Data is saved in the hard disk automatically after any command that changes the data. There is no need to save manually.
+Your task list can be found in the "nehsik.txt" file created in the same directory where the Nehsik.jar file is present.
 
 ## Usage