Create CODE-DOCS.md

CODE-DOCS.md

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+# Outline of the Code
+## HTML
+JSNB is a single page app (SPA). The HTML is in index.htm. In future there could be more pages for html, integration with other tools, and accessing stored files/data.
+
+## JavaScript
+JavaScript code of JSNB is organized into the following files (in the js/ folder):
+1. controller.js: This controls the UI aspects (adding cells, deleting cells, loading noteboks etc.)
+2. libs.js: This contains reusable functions in other modules.
+3. worker.js: This is code where the user generated code is excecuted.
+4. github.js: Functions for interacting with GitHub API.
+5. modal.js: Functions for operating modal (UI) - this is from PICOCSS
+
+## CSS
+The CSS is kept minimal with the following files (in css/ folder):
+1. pico.min.css: PICO CSS
+2. style.css: Custom CSS
+
+## Codemirror
+Codemirror is an opesource UI framework for showing code editor in HTML. Three files (in the file codemirror/) are used in JSNB. License for the same is copied in the folder.
+1. codemirror.css: Styling for the editor.
+2. codemirror.js: Core codemirror functions.
+3. javascript.js: JavaScript specific functionality of codemirror.