Added quickstart guide. (#1173)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._


### Type of change

- [x] Documentation Update

docs/getstarted/_category_.json

@@ -0,0 +1,8 @@
+{
+  "label": "Get started",
+  "position": 0,
+  "link": {
+    "type": "generated-index",
+    "description": "quickstart and more"
+  }
+}

docs/build_from_source.md → docs/getstarted/build_from_source.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 1
-slug: /
+slug: /build_from_source
 ---
 
 # Build from Source

docs/getstarted/quickstart.md

@@ -0,0 +1,102 @@
+---
+sidebar_position: 1
+slug: /
+---
+
+# Quickstart
+
+## Prerequisites
+
+CPU >= 4 cores, with FMA and SSE4_2
+RAM >= 16 GB
+Disk >= 50 GB
+OS: Linux x86_64 or aarch64
+Glibc >=2.17
+
+## Deploy Infinity database
+
+### Deploy Infinity using Docker on Linux x86_64 and MacOS x86_64
+
+```bash
+sudo mkdir -p /var/infinity && sudo chown -R $USER /var/infinity
+docker pull infiniflow/infinity:nightly
+docker run -d --name infinity -v /var/infinity/:/var/infinity --ulimit nofile=500000:500000 --network=host infiniflow/infinity:nightly
+```
+
+### Deploy Infinity using binary package on Linux x86_64
+
+You can download the binary package (deb, rpm, or tgz) for your respective host operating system from https://github.com/infiniflow/infinity/releases. The prebuilt packages are compatible with Linux distributions based on glibc 2.17 or later, for example, RHEL 7, Debian 8, Ubuntu 14.04.
+
+Fedora/RHEL/CentOS/OpenSUSE
+```bash
+sudo rpm -i infinity-0.2.0-dev-x86_64.rpm
+sudo systemctl start infinity
+```
+
+Ubuntu/Debian
+```bash
+sudo dpkg -i infinity-0.2.0-dev-x86_64.deb
+sudo systemctl start infinity
+```
+### 🛠️ Build from Source
+
+See [Build from Source](./build_from_source.md).
+
+## Install a Python client
+
+`infinity-sdk` requires Python 3.10+.
+
+```bash
+pip3 install infinity-sdk==0.2.0.dev1
+```
+
+## Import necessary modules
+
+```python
+import infinity
+import infinity.index as index
+from infinity.common import REMOTE_HOST
+from infinity.common import ConflictType
+```
+
+## Connect to the remote server
+
+```python
+infinity_obj = infinity.connect(REMOTE_HOST)
+```
+
+## Get a database
+
+```python
+db = infinity_obj.get_database("default_db")
+```
+
+## Create a table
+
+```python
+# Drop my_table if it already exists
+db.drop_table("my_table", ConflictType.Ignore)
+# Create a table named "my_table"
+table = db.create_table(
+          "my_table", {
+            "num": {"type": "integer"}, 
+            "body": {"type": "varchar"},
+            "vec": {"type": "vector, 4, float"}
+          })
+```
+
+## Insert two records 
+
+```python
+table.insert([{"num": 1, "body": "unnecessary and harmful", "vec": [1.0, 1.2, 0.8, 0.9]}])
+table.insert([{"num": 2, "body": "Office for Harmful Blooms", "vec": [4.0, 4.2, 4.3, 4.5]}])
+```
+
+## Execute a vector search
+
+```python
+res = table.output(["*"]).knn("vec", [3.0, 2.8, 2.7, 3.1], "float", "ip", 2).to_pl()
+print(res)
+```
+
+> 💡 For more information about the Python API, see the [Python API Reference](../references/pysdk_api_reference.md).

docs/references/_category_.json

@@ -1,6 +1,6 @@
 {
   "label": "References",
-  "position": 2,
+  "position": 3,
   "link": {
     "type": "generated-index",
     "description": "miscellaneous references"