Add readme

README.md

@@ -0,0 +1,84 @@
+# BlueNBT
+BlueNBT is an NBT (De)Serializer with an API inspired by the [GSON](https://github.com/google/gson) library.
+It's basically GSON for NBT instead of JSON data.
+If you used GSON before you will feel right at home!
+
+## Requirements
+BlueNBT requires **Java 21**
+
+## Adding BlueNBT to your Project
+
+### Gradle
+```kotlin
+repositories {
+    maven ( "https://repo.bluecolored.de/releases" )
+}
+
+dependencies {
+    implementation ( "de.bluecolored.bluenbt:BlueNBT:2.3.0" )
+}
+```
+
+### Maven
+```xml
+<repositories>
+    <repository>
+        <id>bluecolored</id>
+        <url>https://repo.bluecolored.de/releases</url>
+    </repository>
+</repositories>
+
+<dependency>
+    <groupId>de.bluecolored.bluenbt</groupId>
+    <artifactId>BlueNBT</artifactId>
+    <version>2.3.0</version>
+</dependency>
+```
+
+## Usage
+**[API Javadoc](https://repo.bluecolored.de/javadoc/releases/de/bluecolored/bluenbt/BlueNBT/latest)**
+
+The primary class to use is [`BlueNBT`](https://github.com/BlueMap-Minecraft/BlueNBT/blob/master/src/main/java/de/bluecolored/bluenbt/BlueNBT.java). 
+You can easily create yourself an instance using `new BlueNBT()`. You can configure each BlueNBT instance separately with
+different settings and Type(De)Serializers. You can reuse the same BlueNBT instance for as many (de)serialization operations
+as you like.
+
+### First Example
+First you want to declare the data-structure that you want to write/read to/from an NBT-Data stream.   
+For Example:
+```java
+class MyData {
+    int someNumber;
+    String someString;
+    long[] anArrayOfLongs;
+    List<MoreData> aLotMoreData;
+}
+
+class MoreData {
+    boolean isData;
+    Map<String, List<String>> muchData; 
+}
+```
+Now all you need to do to write all this data to an NBT-file is: 
+```java
+BlueNBT blueNBT = new BlueNBT();
+try (
+        OutputStream out = Files.newOutputStream(Path.of("myFile.nbt"));
+        OutputStream compressedOut = new BufferedOutputStream(new GzipOutputStream(in))
+){
+    blueNBT.write(myData, compressedOut);
+}
+```
+And reading it again is equally easy:
+```java
+BlueNBT blueNBT = new BlueNBT();
+try ( 
+        InputStream in = Files.newInputStream(Path.of("myFile.nbt"));
+        InputStream compressedIn = new BufferedInputStream(new GZIPInputStream(in))
+){
+    MyData myData = blueNBT.read(compressedIn, MyData.class);
+}
+```
+> **Note** that both times we GZIP(De)Compressed our streams before writing/reading. This is because usually all nbt-files are
+> GZIP-Compressed, BlueNBT does **not** do this for us to allow more flexibility.
+> Also, make sure to use buffered streams before (de)compression to greatly improve compression-performance.