feat: add Fluid Typography Generator extension for VSCode

- Implemented core functionality to generate fluid typography CSS variables based on user-defined breakpoints and font sizes.
- Created configuration options for output format (Tailwind or vanilla CSS) and rounding settings.
- Added input parsing for settings from text files or VSCode interface.
- Developed CSS generation logic with support for `clamp()` and optional rounding.
- Included tests for parsing settings, generating CSS, and inserting text at selection in the editor.
- Documented project details and usage in project.md.
- Added example CSS output in typography.css.

test/webviewText.test.js

@@ -0,0 +1,26 @@
+const assert = require('node:assert/strict');
+const test = require('node:test');
+
+const { insertTextAtSelectionValue } = require('../src/webviewText');
+
+test('insertTextAtSelectionValue inserts clipboard text at the caret', () => {
+  assert.deepEqual(
+    insertTextAtSelectionValue('text-14px: 12px-14px', 20, 20, '\ntext-16px: 14px-16px'),
+    {
+      value: 'text-14px: 12px-14px\ntext-16px: 14px-16px',
+      selectionStart: 41,
+      selectionEnd: 41,
+    },
+  );
+});
+
+test('insertTextAtSelectionValue replaces selected text', () => {
+  assert.deepEqual(
+    insertTextAtSelectionValue('before OLD after', 7, 10, 'NEW'),
+    {
+      value: 'before NEW after',
+      selectionStart: 10,
+      selectionEnd: 10,
+    },
+  );
+});