doc: Update README.md (#626)

Include a description for codemirror-merge, letting readers know what it is about and how to install the package before using it.
uiwjs · Feb 1, 2024 · 042b6c9 · 042b6c9
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diff --git a/core/README.md b/core/README.md
@@ -193,6 +193,12 @@ export default function App() {
 ```
 
 ## Codemirror Merge
+A component that highlights the changes between two versions of a file in a side-by-side view, highlighting added, modified, or deleted lines of code.
+
+```bash
+npm install react-codemirror-merge  --save
+```
+
 
 ```jsx
 import CodeMirrorMerge from 'react-codemirror-merge';