added the readme

shaders/rigshadow.vert

@@ -0,0 +1,27 @@
+#version 430 core
+layout(location = 0) in vec3 pos;
+layout(location = 3) in ivec4 boneIds;
+layout(location = 4) in vec4 weights;
+
+uniform mat4 modl;
+uniform mat4 lightSpaceMatrix;
+
+const int MAX_BONES          = 100;
+const int MAX_BONE_INFLUENCE = 4;
+uniform mat4 finalBonesMatrices[MAX_BONES];
+
+void main()
+{
+    vec4 totalPosition = vec4(0.0);
+    for (int i = 0; i < MAX_BONE_INFLUENCE; i++)
+    {
+        if (boneIds[i] == -1) continue;
+        if (boneIds[i] >= MAX_BONES)
+        {
+            totalPosition = vec4(pos, 1.0);
+            break;
+        }
+        totalPosition += finalBonesMatrices[boneIds[i]] * vec4(pos, 1.0) * weights[i];
+    }
+    gl_Position = lightSpaceMatrix * modl * totalPosition;
+}