Update docs for Java

.gitignore

@@ -1,4 +1,5 @@
 haxe-build.zip
 build/
 
-*.jar
+*.jar
+*.class

README.md

@@ -1,31 +1,55 @@
 # EPIC QR Decoder
 
-Haxe library to decode a QR code on a modern EPIC Card.
+Haxe library to decode a QR code on a modern EPIC Card. This is a polyglot repo,
+containing source code for multiple languages:
+
+- Haxe
+- Java
+
+The Haxe code can be cross-compiled to [several targets](https://haxe.org/documentation/introduction/compiler-targets.html)
+including PHP/Python/Flash/JVM/JS etc.
 
 ## TODO
 
-- [ ] Tests.
+- [ ] Tests for Haxe.
 - [ ] Publish 1.0.
-- [ ] Publish releases in other languages.
+- [ ] Publish releases in Swift.
+- [ ] Publish releases in JS.
+- [ ] Create maven release on GitHub Packages.
+- [ ] Create Demo website.
 
 ## Usage
 
+### Haxe
+
 ```haxe
 import eci.EpicQR;
 
 class Main{
 	static function Main(){
-		var result = decrypt("Kk0pDEzxYcusltFhJmqL/LLzJtXYHH/a1rJfkK2GjzA1x5jrzaeT1ULEF38L7/lIQ8w3c+H4ePeuVs2HuMYDUg==");
-		trace(result.epic);
-		trace(result.id);
+		// This is the result of scanning the QR code as text.
+		var result = decrypt("dbhvecY6Roa4NF3gAzEbkTibZZzXAEYpMg8197BQWMS2+ID24FGDKWB5IEcuxjsA81ChprhSO3EsjKMRDbBWLg==");
+		trace(result.epic); // "ABC1234566"
+		trace(result.id); // 1234
 	}
 }
 ```
 
+### Java
+
+```java
+import eci.EpicQR;
+// This is the result of scanning the QR code as text.
+String e1 = "dbhvecY6Roa4NF3gAzEbkTibZZzXAEYpMg8197BQWMS2+ID24FGDKWB5IEcuxjsA81ChprhSO3EsjKMRDbBWLg==";
+Result r1 = EpicQR.decode(e1);
+assert r1.epic.equals("ABC1234566") : "Invalid EPIC";
+assert r1.id == 1234 :  "Invalid Unique ID";
+```
+
 ## Specification
 
-See <SPEC.md>.
+See [`SPEC.md`](SPEC.md).
 
 ## LICENSE
 
-Licensed under MIT. See `LICENCE` file for more details.
+Licensed under MIT. See [`LICENCE`](LICENSE) file for more details.