Add README of example directory

example/README.md

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+# Examples
+
+## Python SDK examples
+
+The Python scripts in the current directory provides the examples of the infinity SDK API. Before running these scripts, please ensure that the correct version of infinity SDK is installed. If you are using the server version of Infinity, you can use the following command to install it
+
+```shell
+pip install infinity-sdk==0.5.0.dev7
+```
+
+To use Infinity locally as a Python module, install the Infinity Embedded SDK:
+
+```shell
+pip install infinity-embedded-sdk==0.5.0.dev7
+```
+
+Once the installation completes, run some simple examples:
+
+```shell
+python simple_example.py
+```
+
+## HTTP examples
+
+We provide several SHELL scripts in the **/example/http** directory, and you need to install `curl` to run these scripts. For Debian or Ubuntu users, use the following command:
+
+```shell
+sudo apt install curl
+```
+
+The HTTP APIs work only with the Infinity server. Ensure that an Infinity server is running properly before executing these scripts:
+
+```shell
+bash http/create_list_show_database.sh
+```