Start document project architecture

Author: eliot-akira

docs/architecture.md

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+# Architecture
+
+## File structure
+
+- `assets`
+  
+  Frontend and admin assets, such as JS, CSS, and image files.
+
+  - `build` - Bundled and minified files
+  - `src` - Source files, such as JSX and Sass
+
+- `docs`
+
+  Documentation in Markdown format.
+
+- `includes`
+  - `admin`
+  - `block`
+  - `integrations`
+  - `legacy`
+
+- `vendor/tangible`
+
+  Project dependencies installed with `npm install`. These are included in the plugin zip archive and published.
+
+  - `fields`
+  - `framework`
+  - `template-system`
+  - `updater`
+
+- `vendor/tangible-dev`
+
+  These are dev dependencies installed with `npm run install:dev`. They're excluded from the archive.
+
+  - `advanced-custom-fields`
+  - `beaver-builder-lite-version`
+  - `blocks-editor`
+  - `elementor`