Add README

Author: FlowArg

README.MD

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+# AzulJavaDownloader
+
+This library is used to download the Azul Java binaries from the Azul CDN.
+
+#### Example :
+
+```java
+ final AzulJavaDownloader downloader = new AzulJavaDownloader(System.out::println);
+ final Path javas = Paths.get("javas"); // The directory where the Java versions will be downloaded.
+ final AzulJavaBuildInfo buildInfoWindows = downloader.getBuildInfo(new RequestedJavaInfo("17", AzulJavaType.JDK, "windows", "x64", true)); // jdk 17 with javafx for Windows 64 bits
+ final Path javaHomeWindows = downloader.downloadAndInstall(buildInfoWindows, javas);
+ System.out.println(javaHomeWindows.toAbsolutePath()); // The path to the Java home directory
+ 
+ final AzulJavaBuildInfo buildInfoLinux = downloader.getBuildInfo(new RequestedJavaInfo("17", AzulJavaType.JDK, "linux", "x64", true)); // jdk 17 with javafx for linux 64 bits
+ final Path javaHomeLinux = downloader.downloadAndInstall(buildInfoLinux, javas);
+ System.out.println(javaHomeLinux.toAbsolutePath()); // The path to the Java home directory
+```