update readme file (#6)

Update the readme file with additional information:

* installation
* configuration

README.md

@@ -1,2 +1,62 @@
-# aui-cli
-Command line client for Audience Insights
+# Dynamics 365 Audience Insights CLI
+
+The AuI CLI is a command line tool for [Dynamics 365 Audience Insights](https://dynamics.microsoft.com/ai/customer-insights/audience-insights-capability).
+
+It is based on the [customerinsights](https://pypi.org/project/customerinsights) Python library and exposes some of the [Audience Insights APIs](https://docs.microsoft.com/dynamics365/customer-insights/audience-insights/apis)
+
+## Installation
+
+1. Install Python 3.9 or later from [python.org](https://www.python.org/downloads), apt-get, or some other installer.
+
+1. Install the [poetry](https://python-poetry.org) package
+
+1. Start a shell:
+
+    ```bash
+    poetry shell
+    ```
+
+1. Install the packages:
+
+    ```bash
+    poetry install
+    ```
+
+1. Build `aui-cli`:
+
+    ```bash
+    poetry build
+    ```
+
+1. Verify the correct installation:
+
+    ```bash
+    > aui-cli --help
+
+    Group
+        aui-cli
+
+    Subgroups:
+        datasources : Commands to manage data sources.
+        instances   : Commands to manage instances.
+        measures    : Commands to manage measures.
+        roles       : Commands to manage access roles.
+        search      : Commands to manage search.
+        segments    : Commands to manage segments.
+    ```
+
+## Configuration
+
+Add the `api_key` and OAuth token in the file `~/.aui-cli/config`
+
+```text
+[authentication]
+api_key = REDACTED
+token = REDACTED
+```
+
+## Contributing
+
+### Code of Conduct
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.