Add arch chart

Author: auxten

README.md

@@ -15,6 +15,7 @@
 
 ## Table of Contents
 * [Features](#features)
+* [Arch](#arch)
 * [Installation](#installation)
 * [Usage](#usage)
 * [Documentation](#documentation)
@@ -27,9 +28,14 @@
      
 * In-process SQL OLAP Engine, powered by ClickHouse
 * No need to install ClickHouse
-* Minimal data copy from C++ to Python
+* Minimized data copy from C++ to Python with [python memoryview](https://docs.python.org/3/c-api/memoryview.html)
 * Input&Output support Parquet, CSV, JSON, Arrow, ORC and [more](https://clickhouse.com/docs/en/interfaces/formats)
 
+## Arch
+<div align="center">
+  <img src="docs/_static/arch-chdb.png" height="300">
+</div>
+
 ## Installation
 Currently, chDB only supports Python 3.7+ on macOS and Linux.
 ```bash
@@ -47,19 +53,26 @@ res = chdb.query('select version()', 'CSV'); print(str(res.get_memview().tobytes
 
 ### work with Parquet or CSV
 ```python
-chdb.query('select * from file("data.parquet", Parquet)', 'Pretty')
-chdb.query('select * from file("data.csv", CSV)', 'Pretty')
+chdb.query('select * from file("data.parquet", Parquet)', 'CSV')
+chdb.query('select * from file("data.csv", CSV)', 'CSV')
 ```
 
+### pandas dataframe output
+```python
+chdb.query('select * from file("data.parquet", Parquet)', 'Dataframe')
+```
+
+more examples, please refer to [examples](examples)
+
 ## Documentation
 - For SQL syntax, please refer to [ClickHouse SQL Reference](https://clickhouse.com/docs/en/sql-reference/syntax)
 
 ## Contributing
 Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are **greatly appreciated**.
 There are something you can help:
-* Report bugs on [GitHub Issues](https://github.com/auxten/chdb/issues).
-* Help me with Windows support, I don't know much about Windows toolchain.
-* The Python Wrapper just have a `query` function. I want to add more functions to make it more convenient to use. like `toPandas`, `toNumpy` and so on.
+- Report bugs on [GitHub Issues](https://github.com/auxten/chdb/issues).
+- [ ] Help me with Windows support, I don't know much about Windows toolchain.
+- [x] The Python Wrapper just have a `query` function. I want to add more functions to make it more convenient to use. like `toPandas`, `toNumpy` and so on.
 
 ## License
 AGPL-v3.0 or Commercial License, see [LICENSE](LICENSE.txt) for more information.
@@ -69,5 +82,5 @@ chDB is mainly based on [ClickHouse](https://github.com/ClickHouse/ClickHouse)
 for trade mark and other reasons, I named it chDB.
 
 ## Contact
-- Email: `echo "YXV4dGVud3BjQGdtYWlsLmNvbQ==" | base64 -d`
+- Email: [email protected]
 - Twitter: [@auxten](https://twitter.com/auxten)