doc: added readme

README.md

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+# Lillero-processor
+Lillero-processor is an annotation processor made to simplify development of [Lillero](https://git.fantabos.co/lillero) patches, minimising the amount of boilerplate code needed.
+
+## How to use
+First things first, add the processor and its dependencies to your `build.gradle`:
+```groovy
+dependencies {
+	implementation 'ftbsc.lll:processor:0.1.0'
+	annotationProcessor 'com.squareup:javapoet:1.13.0'
+	annotationProcessor 'ftbsc:lll:0.2.1'
+	annotationProcessor 'ftbsc.lll:processor:0.1.0'
+}
+```
+
+That's about all the effort you need to put in! Now, this:
+```java
+package example.patches;
+import net.minecraft.client.Minecraft;
+import ftbsc.lll.processor.annotations.*;
+@Patch(value = Minecraft.class, reason = "crash the game as soon as it loads")
+public class SamplePatch implements Opcodes {
+	@Target
+	public void tick() {};
+	@Injector
+	public static void yourCustomInjector(ClassNode clazz, MethodNode main) {
+		InsnList insnList = new InsnList();
+		insnList.add(new InsnNode(POP));
+		main.instructions.insert(insnList);
+	}
+}
+```
+
+will automatically generate:
+
+```java
+package example.patches;
+import ftbsc.lll.IInjector;
+public class SamplePatchInjector implements IInjector {
+	public String name()        { return "SamplePatch"; }
+	public String reason()      { return "crash the game as soon as it loads"; }
+	public String targetClass() { return "net.minecraft.client.Minecraft"; }
+	public String methodName()  { return "func_71407_l"; } // tick()
+	public String methodDesc()  { return "()V"; } // void, no args 
+	public void inject(ClassNode clazz, MethodNode main) {
+		SamplePatch.yourCustomInjector(clazz, main);
+	}
+}
+```
+
+Happy patching!