init commit for new extension WordHighlighter - for highlighting words.

xExtension-WordHighlighter/README.md

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+# WordHighlighter extension
+
+A FreshRSS extension which give ability to highlight user-defined words.
+
+## Usage
+
+To use it, upload this directory in your `./extensions` directory and enable it on the extension panel in FreshRSS. You can add words to be highlighted by clicking on the manage button ⚙️.
+See also official docs at freshrss.github.io/FreshRSS/en/admins/15_extensions.html
+
+## Preview
+
+Light theme:
+
+![snapshot](./snapshot.png)
+
+<!-- markdownlint-disable -->
+<details>
+  <summary>click to see example screenshot in dark theme</summary>
+
+![snapshot-dark-theme](./snapshot-dark.png)
+
+</details>
+<!-- markdownlint-enable -->
+
+## Changelog
+
+- 0.0.1 initial version (as a proper FreshRSS extension)