Updated Getting started (markdown)

Getting-started.md

@@ -180,3 +180,33 @@ await milvusClient.dataManager.search({
 });
 ```
 
+# Querying
+
+This topic describes how to conduct a query.
+
+In addition to vectors, Milvus supports data types such as boolean, integers, floating-point numbers, and more.
+
+A query is a search on all existing data. In Milvus, you can run a query which will return all the results that meet your specified requirements. Use boolean expression to specify the requirements.
+
+
+In Python
+
+```
+expr = "id in [2,4,6,8]"
+output_fields = ["id", "vector"]
+res = collection.query(expr, output_fields)
+# check the results
+sorted_res = sorted(res, key=lambda k: k['film_id'])
+print(sorted_res)
+```
+
+In Node
+
+```
+await milvusClient.dataManager.query({
+  collection_name: COLLECTION_NAME,
+  expr: "id in [2,4,6,8]",
+  output_fields: ["id", "vector"],
+});
+```
+