update readme

README.md

@@ -1,3 +1,4 @@
+![experimental](https://github.com/GIScience/badges/raw/master/status/experimental.svg)
 [![main](https://github.com/r3stl355/delta-sharing-rust-client/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/r3stl355/delta-sharing-rust-client/actions/workflows/main.yml)
 
 # Delta Sharing client library for Rust
@@ -7,18 +8,18 @@ This is a simple library for Rust to access data published via Delta Sharing
 ## Features
 
 - Retrieve Delta Sharing information (shares, schemas, tables and files)
-- Query shared table data using [Polars](https://pola-rs.github.io/polars/polars/index.html). `get_dataframe` downloads the table's parquet files (and caches then locally for subsequent queries) and returns a lazy abstraction (logical plan) over an eager DataFrame. This lazy abstraction provides methods for incrementally modifying that logical plan until output is requested (via `collect`).
+- Query shared table data using [Polars](https://pola-rs.github.io/polars/polars/index.html). `get_dataframe` downloads the table's parquet files (and caches then locally for subsequent reads) and returns a lazy abstraction (logical plan) over an eager DataFrame. This lazy abstraction provides methods for incrementally modifying that logical plan until the final output is requested (via `collect`).
 
 ## Pre-requisites
 
 - [Delta Sharing](https://databricks.com/product/delta-sharing) set up with at least one shared table 
 - Rust is installed, e.g. as described [here](https://doc.rust-lang.org/cargo/getting-started/installation.html)
 
-## Sample use
+## Quick start
 
 Use this [sample project](https://github.com/r3stl355/delta-sharing-rust-cllient-use-example) for a quick start
 
-## TODO
+## TODO (Work in progress)
 
-- move to `async` mode (e.g. swap blocking `reqwest` Client to async version)
+- implement `async` mode (e.g. swap blocking `reqwest` client to async version) - 
 - write more tests