Updating README

README.md

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+![LabelZoom Logo](LabelZoom_Logo_f_400px.png)
+
 # labelzoom-api
-LabelZoom API
+
+[![Build Status](https://github.com/labelzoom/labelzoom-api/actions/workflows/gradle-build.yml/badge.svg?branch=main)](https://github.com/labelzoom/labelzoom-api/actions?query=branch%3Amain)
+
+The LabelZoom API is the foundation on which all of LabelZoom's products and services are built. The API serves to define the following:
+- **Data model:** [/src/main/java/com/labelzoom/api/model](/src/main/java/com/labelzoom/api/model) - The data model of a LabelZoom label
+- **I/O interfaces**
+  - **Input**: [/src/main/java/com/labelzoom/api/input](/src/main/java/com/labelzoom/api/input) - The LabelReader interface, which can be implemented to convert other types of files into LabelZoom labels
+  - **Output:** [/src/main/java/com/labelzoom/api/output](/src/main/java/com/labelzoom/api/output) - The LabelWriter interface, which can be implemented to convert LabelZoom labels into other types of files
+- **Services:** [/src/main/java/com/labelzoom/api/services](/src/main/java/com/labelzoom/api/services) - Various interfaces that support the implementations of the I/O interfaces
+- **Utilities**
+  - [/src/main/java/com/labelzoom/api/diagnostics](/src/main/java/com/labelzoom/api/diagnostics) - Lightweight utilities to measure the performance of the implemented interfaces
+  - [/src/main/java/com/labelzoom/api/util](/src/main/java/com/labelzoom/api/util) - Domain-centric utilities aligned to the business domain (e.g. 2D graphics, image manipulation, etc.)