Fixed readme file

README.md

@@ -1,11 +1,13 @@
 # NAACCR API Client
 
-[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=imsweb_naaccr_api_client&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=imsweb_naaccr_api_client)
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=imsweb_naaccr-api-client&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=imsweb_naaccr-api-client)
 [![integration](https://github.com/imsweb/naaccr-api-client/workflows/integration/badge.svg)](https://github.com/imsweb/naaccr-api-client/actions)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.imsweb/naaccr-api-client/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.imsweb/naaccr-api-client)
 
 This library allows to call the NAACCR API using Java DTOs.
 
+By default, it uses version 1.0 of the public API (https://apps.naaccr.org/data-dictionary/api/).
+
 ## Download
 
 The library is available on [Maven Central](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.imsweb%22%20AND%20a%3A%22naaccr-api-client%22).
@@ -16,4 +18,21 @@ You can check out the [release page](https://github.com/imsweb/naaccr-api-client
 
 ## Usage
 
-Coming soon...
+Create a client (using the NaaccrApiClient::getInstance method) and call the few methods that correspond to the API end points.
+
+```java
+NaaccrApiClient client = NaaccrApiClient.getInstance();
+NaaccrDataItem item = client.getDataItem(NAACCR_LATEST, "primarySite");
+System.out.println(item.getItemName());
+```
+
+For a comprehensive list of available methods, see the javadocs of the 
+[NaaccrApiClient](https://github.com/imsweb/naaccr-api-client/blob/main/src/main/java/com/imsweb/naaccr/api/client/NaaccrApiClient.java) class.
+
+## About this library
+
+This library was developed through the [SEER](http://seer.cancer.gov/) program.
+
+The Surveillance, Epidemiology and End Results program is a premier source for cancer statistics in the United States.
+The SEER program collects information on incidence, prevalence and survival from specific geographic areas representing
+a large portion of the US population and reports on all these data plus cancer mortality data for the entire country.