[skip ci] add docs (#6091)

* [skip ci] add comparison

Signed-off-by: LocoRichard <lichen.wang@zilliz.com>

* [skip ci] update readme

Signed-off-by: LocoRichard <lichen.wang@zilliz.com>

* [skip ci] update readmecn

Signed-off-by: LocoRichard <lichen.wang@zilliz.com>

milvus20vs1x.md

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+# Milvus 2.0 vs. 1.x: Cloud-native, distributed architecture, highly scalable, and more
+
+<table class="comparison">
+<thead>
+	<tr>
+		<th>&nbsp;</th>
+		<th>Milvus 1.x</th>
+		<th>Milvus 2.0</th>
+	</tr>
+	<tr>
+		<th>Architecture</th>
+		<td>Shared storage</td>
+		<td>Cloud native</td>
+	</tr>
+</thead>
+<tbody>
+	<tr>
+		<th>Scalability</th>
+		<td>1 to 32 read nodes with only one write node</td>
+		<td>500+ nodes</td>
+	</tr>
+  	<tr>
+		<th>Durability</th>
+		<td><li>Local disk</li><li>Network file system (NFS)</li></td>
+		<td><li>Object storage service (OSS)</li><li>Distributed file system (DFS)</li></td>
+	</tr>
+  	<tr>
+		<th>Availability</th>
+		<td>99%</td>
+		<td>99.9%</td>
+	</tr>
+	<tr>
+		<th>Data consistency</th>
+		<td>Eventual consistency</td>
+		<td>Three levels of consistency:<li>Strong</li><li>Bounded Staleness</li><li>Session</li><li>Consistent prefix</li></td>
+	</tr>
+	<tr>
+		<th>Data types supported</th>
+		<td>Vectors</td>
+		<td><li>Vectors</li><li>Fixed-length scalars</li><li>String and text (in planning)</li></td>
+	</tr>
+	<tr>
+		<th>Basic operations supported</th>
+		<td><li>Data insertion</li><li>Data deletion</li><li>Approximate nearest neighbor (ANN) Search</li></td>
+		<td><li>Data insertion</li><li>Data deletion (in planning)</li><li>Data query</li><li>Approximate nearest neighbor (ANN) Search</li><li>Recurrent neural network (RNN) search (in planning)</li></td>
+	</tr>
+	<tr>
+		<th>Advanced features</th>
+		<td><li>Mishards</li><li>Milvus DM</li></td>
+		<td><li>Scalar filtering</li><li>Time Travel</li><li>Multi-site deployment and multi-cloud integration</li><li>Data management tools</li></td>
+	</tr>
+	<tr>
+		<th>Index types and libraries</th>
+		<td><li>Faiss</li><li>Annoy</li><li>Hnswlib</li><li>RNSG</li></td>
+		<td><li>Faiss</li><li>Annoy</li><li>Hnswlib</li><li>RNSG</li><li>ScaNN (in planning)</li><li>On-disk index (in planning)</li></td>
+	</tr>
+	<tr>
+		<th>SDKs</th>
+		<td><li>Python</li><li>Java</li><li>Go</li><li>RESTful</li><li>C++</li></td>
+		<td><li>Python</li><li>Go (in planning)</li><li>RESTful (in planning)</li><li>C++ (in planning)</li></td>
+	</tr>
+	<tr>
+		<th>Release status</th>
+		<td>Long-term support (LTS)</td>
+		<td>Release candidate. A stable version will be released in August.</td>
+	</tr>
+</tbody>
+</table>