Start implementing the ASM helpers

src/main/java/com/falsepattern/lib/asm/AsmFieldNotFoundException.java

@@ -0,0 +1,7 @@
+package com.falsepattern.lib.asm;
+
+public class AsmFieldNotFoundException extends AsmTransformException {
+    public AsmFieldNotFoundException(final String field) {
+        super("can't find field " + field);
+    }
+}