Added readme for water material

materialsLibrary/materials/water/readme.md

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+# Water material
+
+## Using the water material
+
+The water material needs at least only a bump texture to render properly.
+Just create a new reference of the material and assign its bump texture:
+
+```
+var ground = BABYLON.Mesh.CreateGround("ground", 512, 512, 32, scene);
+
+var waterMaterial = new BABYLON.WaterMaterial("water_material", scene);
+waterMaterial.bumpTexture = new BABYLON.Texture("bump.png", scene); // Set the bump texture
+
+ground.material = waterMaterial;
+```
+
+To reflect and refract the world, you just have to add the wanted meshes to the render list:
+
+```
+waterMaterial.addToRenderList(skybox);
+waterMaterial.addToRenderList(mesh1);
+waterMaterial.addToRenderList(mesh2);
+// ... etc.
+```
+
+That's all.
+
+## Customize the water material
+
+You can customize special properties of the material:
+
+```
+waterMaterial.windForce = 45; // Represents the wind force applied on the water surface
+waterMaterial.waveHeight = 1.3; // Represents the height of the waves
+waterMaterial.bumpHeight = 0.3; // According to the bump map, represents the pertubation of reflection and refraction
+waterMaterial.windDirection = new BABYLON.Vector2(1.0, 1.0); // The wind direction on the water surface (on width and height)
+waterMaterial.waterColor = new BABYLON.Color3(0.1, 0.1, 0.6); // Represents the water color mixed with the reflected and refracted world
+waterMaterial.colorBlendFactor = 2.0; // Factor to determine how the water color is blended with the reflected and refracted world
+waterMaterial.waveLength = 0.1; // The lenght of waves. More the value small, more there are waves on the mesh
+```
+