docs: added project code documentation

docs/flutterdocs/static-assets/readme.md

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+# Dart documentation generator
+
+This directory includes static sources used by the Dart documentation generator
+through the `dart doc` command.
+
+To learn more about generating and viewing the generated documentation,
+check out the [`dart doc` documentation][].
+
+[`dart doc` documentation]: https://dart.dev/tools/dart-doc
+
+## Third-party resources
+
+## highlight.js
+
+Generated from https://highlightjs.org/download/ on 2021-07-13.
+
+**License:** https://github.com/highlightjs/highlight.js/blob/main/LICENSE
+
+**Included languages:**
+
+* bash
+* c  
+* css
+* dart
+* diff
+* html, xml
+* java
+* javascript
+* json
+* kotlin
+* markdown
+* objective-c
+* plaintext  
+* shell
+* swift
+* yaml