Initial data commit

Task/Grayscale-image/Java/grayscale-image.java

@@ -0,0 +1,23 @@
+void convertToGrayscale(final BufferedImage image){
+    for(int i=0; i<image.getWidth(); i++){
+        for(int j=0; j<image.getHeight(); j++){
+            int color = image.getRGB(i,j);
+
+            int alpha = (color >> 24) & 255;
+            int red = (color >> 16) & 255;
+            int green = (color >> 8) & 255;
+            int blue = (color) & 255;
+
+            final int lum = (int)(0.2126 * red + 0.7152 * green + 0.0722 * blue);
+
+            alpha = (alpha << 24);
+            red = (lum << 16);
+            green = (lum << 8);
+            blue = lum;
+
+            color = alpha + red + green + blue;
+
+            image.setRGB(i,j,color);
+        }
+    }
+}