Added documentation

docs/docs/index.mdx

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+# 👋 Welcome to LangFlow
+
+LangFlow is an easy way to prototype [LangChain](https://github.com/hwchase17/langchain) flows. The drag-and-drop feature allows quick and effortless experimentation, while the built-in chat interface facilitates real-time interaction. It provides options to edit prompt parameters, create chains and agents, track thought processes, and export flows.
+
+import ThemedImage from '@theme/ThemedImage';
+import useBaseUrl from '@docusaurus/useBaseUrl';
+import ZoomableImage from '/src/theme/ZoomableImage.js';
+
+<div style={{ marginBottom: '20px', display: 'flex', justifyContent: 'center' }}>
+<ZoomableImage
+  alt="Docusaurus themed image"
+  sources={{
+    light: 'img/new_langflow2.gif',
+  }}
+  />
+</div>