Removing main from project

* main class was there to test the NN functionality by solving XOR

.gitignore

@@ -1,2 +1,3 @@
 .idea
-target
+target
+out

README.md

@@ -11,4 +11,4 @@ This is a very basic Java Neural Network library using EJML (Efficient Java Matr
 
 ## TODO
 
-- add support for multy-layered Neural Networks
+- Add support for multy-layered Neural Net works

src/main/java/NeuralNetwork.java

@@ -1,18 +1,17 @@
 import org.ejml.simple.SimpleMatrix;
 import utilities.Sigmoid;
 
-import java.util.Arrays;
 import java.util.Random;
 
 /**
  * Created by KimFeichtinger on 04.03.18.
  */
 public class NeuralNetwork {
 
-    private static final double LEARNING_RATE = 0.1;
-
     Random r = new Random();
 
+    private double learningRate = 0.1;
+
     // "size" of the neural network
     private int inputNodes;
     private int hiddenNodes;
@@ -93,7 +92,7 @@ private SimpleMatrix calculateLayer(SimpleMatrix weights, SimpleMatrix bias, Sim
     private SimpleMatrix calculateGradient(SimpleMatrix layer, SimpleMatrix error){
         SimpleMatrix gradient = Sigmoid.applySigmoid(layer, true);
         gradient = gradient.elementMult(error);
-        return gradient.scale(LEARNING_RATE);
+        return gradient.scale(learningRate);
     }
 
     private SimpleMatrix calculateDeltas(SimpleMatrix gradient, SimpleMatrix layer){
@@ -104,4 +103,13 @@ private SimpleMatrix arrayToMatrix(double[] i){
         double[][] input = {i};
         return new SimpleMatrix(input).transpose();
     }
+
+    public double getLearningRate() {
+        return learningRate;
+    }
+
+    public void setLearningRate(double learningRate) {
+        this.learningRate = learningRate;
+    }
+
 }