added a shader class and converted existing shaders to files

include/shaders/shader.hpp

@@ -0,0 +1,22 @@
+#ifndef SHADER_H
+#define SHADER_H
+
+#include <string>
+  
+class Shader
+{
+public:
+    // the program ID
+    unsigned int ID;
+  
+    // constructor reads and builds the shader
+    Shader(const char* vertexPath, const char* fragmentPath);
+    // use/activate the shader
+    void use();
+    // utility uniform functions
+    void setBool(const std::string &name, bool value) const;  
+    void setInt(const std::string &name, int value) const;   
+    void setFloat(const std::string &name, float value) const;
+};
+  
+#endif