Document find (#150)

COMMANDS.md

@@ -4,6 +4,7 @@
 - [view](#dnote-view)
 - [edit](#dnote-edit)
 - [remove](#dnote-remove)
+- [find](#dnote-find)
 - [login](#dnote-login)
 - [sync](#dnote-sync)
 
@@ -15,10 +16,10 @@ Add a new note to a book.
 
 ```bash
 # Launch a text editor to add a new note to the specified book.
-$ dnote add linux
+dnote add linux
 
 # Write a new note with a content to the specified book.
-$ dnote add linux -c "find - recursively walk the directory"
+dnote add linux -c "find - recursively walk the directory"
 ```
 
 ## dnote view
@@ -30,13 +31,13 @@ _alias: v_
 
 ```bash
 # List all books.
-$ dnote view
+dnote view
 
 # List all notes in a book.
-$ dnote view golang
+dnote view golang
 
 # See details of a note
-$ dnote view golang 12
+dnote view golang 12
 ```
 
 ## dnote edit
@@ -47,10 +48,10 @@ Edit a note
 
 ```bash
 # Launch a text editor to edit a note with the given index.
-$ dnote edit linux 1
+dnote edit linux 1
 
 # Edit a note with the given index in the specified book with a content.
-$ dnote edit linux 1 -c "New Content"
+dnote edit linux 1 -c "New Content"
 ```
 
 ## dnote remove
@@ -61,10 +62,27 @@ Remove either a note or a book
 
 ```bash
 # Remove the note with `index` in the specified book.
-$ dnote remove JS 1
+dnote remove JS 1
 
 # Remove the book with the `book name`.
-$ dnote remove -b JS
+dnote remove -b JS
+```
+
+## dnote find
+
+_alias: f
+
+Find notes by keywords
+
+```bash
+# find notes by a keyword
+dnote find rpoplpush
+
+# find notes by multiple keywords
+dnote find "building a heap"
+
+# find notes within a book
+dnote find "merge sort" -b algorithm
 ```
 
 ## dnote sync