Add commands to UG

docs/UserGuide.md

@@ -35,10 +35,20 @@ Here are some descriptions of the words we use throughout the User Guide:
 1. Ensure you have Java `11` or above installed in your computer.
 2. Download the latest `DAVE.jar` from here.
 3. Copy the file to the folder you want to use as the *home folder* for D.A.V.E.
-4. Double-click `DAVE.jar` to start the app.
+4. Open a command terminal, `cd` into the folder you put the jar file in, and use the `java -jar DAVE.jar` command to run the application.
+   A GUI similar to the below should appear in a few seconds. Note how the app contains some sample data.
+
+<div align="center">
+    <img src="./images/QuickStartGUI.png" width="500" />
+    <p>After starting up the application</p>
+</div>
 
 # Features
 
+> [!NOTE]
+> Extraneous parameters for commands that do not take in parameters (such as help, exit and clear) will be ignored.
+e.g. if the command specifies `exit 2`, it will be interpreted as the `exit` command.
+
 ### Add lead
 
 - What it does: Add potential leads and their basic information, e.g. name, age, year of study, major, etc.
@@ -380,3 +390,53 @@ from current date to ensure a follow-up by the user.
 - Precise expected outputs when the command fails:
 
 `The person index provided is invalid`
+
+### Locating person by name
+- What it does: Finds persons whose names contain any of the given keywords.
+- Command format: `find NAME [MORE_NAMES]`
+- Example usage: `find John David`
+- Acceptable values for parameter: 
+  - `NAME`: Any name from the list.
+- Precise expected output when the command succeeds:
+
+`<NUMBER> persons listed!`
+
+- Precise expected output when the command fails:
+
+``Invalid command format!
+find: Finds all persons whose names contain any of the specified names (case-insensitive) and displays them as a list with index numbers.
+Parameters: NAME [MORE_NAMES]...
+Example: find alice bob charlie``
+
+>[!NOTE]
+>-  The search is case-insensitive. e.g `John` will match `john`.
+>- Only full words will be matched e.g. `John` will not match `Johns`.
+>- Persons matching at least one keyword will be returned (i.e. OR search). e.g. `find john david` will return `John Doe`, `David Li`
+
+Example usage:
+
+<div align="center">
+    <img src="./images/BeforeFind.png" width = "500"/>
+    <p>Before using find</p>
+</div>
+
+<div align="center">
+    <img src="./images/AfterFind.png" width = "500"/>
+    <p>After using find john david</p>
+</div>
+
+### Clear
+- What it does: Clears all entries from the address book.
+- Command format: `clear`.
+> [!WARNING]
+> This command will delete all the data from the address book. This command cannot be reversed. Proceed with caution.
+- Precise expected output when the command succeeds:
+
+`Address book has been cleared!`
+
+### Exit the program
+- What it does: Exits the program. 
+- Command format: `exit`.
+
+
+

src/main/java/seedu/address/logic/commands/FindCommand.java

@@ -16,8 +16,8 @@ public class FindCommand extends Command {
     public static final String COMMAND_WORD = "find";
 
     public static final String MESSAGE_USAGE = COMMAND_WORD + ": Finds all persons whose names contain any of "
-            + "the specified keywords (case-insensitive) and displays them as a list with index numbers.\n"
-            + "Parameters: KEYWORD [MORE_KEYWORDS]...\n"
+            + "the specified names (case-insensitive) and displays them as a list with index numbers.\n"
+            + "Parameters: NAME [MORE_NAMES]...\n"
             + "Example: " + COMMAND_WORD + " alice bob charlie";
 
     private final NameContainsKeywordsPredicate predicate;