customblock to sittingblock & customblock base without sitting height

src/main/java/one/oth3r/sit/file/SittingBlock.java

@@ -0,0 +1,21 @@
+package one.oth3r.sit.file;
+
+import com.google.gson.annotations.SerializedName;
+
+import java.util.ArrayList;
+
+public class SittingBlock extends CustomBlock {
+    @SerializedName("sitting-height")
+    private Double sittingHeight = 0.5;
+
+    public Double getSittingHeight() {
+        return sittingHeight;
+    }
+
+    public SittingBlock() {}
+
+    public SittingBlock(ArrayList<String> blockIds, ArrayList<String> blockTags, ArrayList<String> blockStates, Double sittingHeight) {
+        super(blockIds, blockTags, blockStates);
+        this.sittingHeight = sittingHeight;
+    }
+}