Create README.md

Author: teamcons

src/README.md

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+# Code Structure
+
+Each Note is an instance of MainWindow initiated by Application.
+Components should be as stupidly simple as possible.
+
+### MainWindow
+Said MainWindow/Note has:
+ - A Headerbar with an editable label
+ - A Sourceview/Sourcebuffer, where all the text happes
+ - An ActionBar, with buttons and a popover
+
+### Services
+Each Note relies on the following supporting services:
+ - Stash, which provides the storage utilities. Each Note is responsible for saving itself
+ - Themer, which provides a custom stylesheet. Each Note has a class buit specifically for its ID, because i havent found how to reliably theme each MainWindow separately
+ - Utils, which provides small functions that are better in a clean separate place instead of drown in the code.
+
+TODO:
+  - Stash should replace Storage
+  - NoteManager complements Storage, and should be replaced too.
+
+### Widgets
+Each Note is built with the following custom widgets:
+ - ColorPill, which is not plumbed in yet but would be the buttons to theme a note on popover
+ - EditableLabel, in GTK3 a custom Widget, in GTK4 should be the GTK one extended for the app
+ - SettingsPopover, which should be the thing with the settings (mostly the ColorPills), which is not plumbed in yet.
+
+TODO: ColorPill and SettingsPopover
+
+
+### Resources
+The Application.css is not ready but should have the nonspecific CSS