doc: improve README and add new features

Improved the README with more comprehensive descriptions, updated screenshots, and clarified installation instructions.

Added support for Markdown syntax highlighting in the note list.
Added new features like:
- Using SQLite for local note caching.
- The potential for adding APIs for other notebook providers.

README.md

@@ -2,19 +2,21 @@
 
 =============
 
-Sublime Text 3/4 plugin for Simplenote.
+Sublime Text 3/4 plugin for Simplenote. Use Sublime Text as a Simplenote client.
 
 * Forked from [quick_simplenote](https://github.com/sickmartian/quick_simplenote)
 * UPDATES:
-  * Python 3.8 compatibility
-  * Sublime Text 4 compatibility
-  * Bug fixes
+    * Python 3.8 compatibility
+    * Sublime Text 4 compatibility
+    * Bug fixes
 
 Planned features:
 
 * Replace the existing RESTful API with WebSocket to reduce network I/O.
 * Add a new note list display mode.
 * Automatically detect whether a note is in Markdown format and apply system tags to inform other platform clients.
+* Using sqlite as the database as notes local cache.
+* Maybe adding APIs for other notebook providers.
 ...
 
 ## Installation
@@ -84,15 +86,17 @@ You need to set up your Simplenote credentials before using the plugin. You can
 | Create Note         | ["super+shift+s", "super+shift+c"] | ["super+shift+s", "super+shift+c"] | ["super+shift+s", "super+shift+c"] |
 | Delete Current Note | ["super+shift+s", "super+shift+d"] | ["super+shift+s", "super+shift+d"] | ["super+shift+s", "super+shift+d"] |
 
+![Alt Key Map](asssets/images/keymap.png "keymap files")
+
 ## Overview
 
 ---------
-Hit Command+Shift+S (OSX) or Windows+Shift+S (Windows) twice to start. First time it will open the settings to setup the credentials.
+Hit Command+Shift+S (OSX) and then Command+Shift+L (OSX) or Windows+Shift+S (Windows) and then Windows+Shift+L (Windows) to start. First time it will open the settings to setup the credentials.
 After setting them it will download the notes.
-![Alt Settings](http://i.imgur.com/q6elJOi.png "Settings files")
+![Alt Settings](asssets/images/settings.png "Settings files")
 
 Hit the shortcut again after the download is done (check the message bar) and it will **show a list of the notes**:
-![Alt Notes](http://i.imgur.com/YTcngPw.png "Note List")
+![Alt Notes](asssets/images/note_list.png "Note List")
 
 It will download notes every time sublime text is launched and every now and then if the _sync_every_ configuration is enabled (has a positive value), so take a look at the bar to check the status.
 
@@ -104,14 +108,17 @@ After the next sync it will be updated on sublime as well
 If you change something on sublime the note will be updated after you save the file:
 ![Alt Sublime Update](http://i.imgur.com/FZVEoef.png "Sublime Update")
 
-You can **create a note** with Command+Shift+S and then Command+Shift+N (OSX) or Windows+Shift+S and then Windows+Shift+N (Windows), a name is assigned according to the first line of the note (remember to save!)
+You can **create a note** with Command+Shift+S and then Command+Shift+C (OSX) or Windows+Shift+S and then Windows+Shift+C (Windows), a name is assigned according to the first line of the note (remember to save!)
 ![Alt Sublime New Note on List](http://i.imgur.com/vH5POCU.png "Sublime New Note on List")
 
+> Markdown syntax support: If your note begins with "# ", it will automatically be marked as markdown format and displayed accordingly.
+![Alt Sublime Note displayed in markdown format](asssets/images/note_markdown.png "Sublime New Note on List")
+
 You can **delete notes** with Command+Shift+S and then Command+Shift+D (OSX) or Windows+Shift+S and then Windows+Shift+D (Windows) while seeing the note
 ![Alt Sublime Delete Note](http://i.imgur.com/3htEmBm.png "Sublime Delete Note")
 
 All those commands are also accesible from the command palette:
-![Alt Command Palette](http://i.imgur.com/n0tROSK.png "Command Palette")
+![Alt Command Palette](asssets/images/command_palette.png "Command Palette")
 
 ## Conflict Resolution