feat(square): initial code to display small red square

src/main.cpp

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <GLFW/glfw3.h>
+
+int main (int argc, char** argv)
+{
+    GLFWwindow* window;
+
+    if (!glfwInit()) {
+        fprintf(stderr, "could not init glfw.\n");
+        return 1;
+
+    }
+    window = glfwCreateWindow(640, 480, "Hello Window", NULL, NULL);
+    if (!window) {
+        fprintf(stderr, "could not initialize glfw window\n");
+        return 1;
+    }
+    glfwMakeContextCurrent(window);
+
+    unsigned char* data = new unsigned char [100 * 100 * 3];
+    for (int y=0; y < 100; y++) {
+        for (int x = 0; x < 100; x++) {
+            data[y * 100 * 3 + x * 3] = 0xff;
+            data[y * 100 * 3 + x * 3 + 1] = 0x00;
+            data[y * 100 * 3 + x * 3 + 2] = 0x00;
+        }
+    }
+
+    while (!glfwWindowShouldClose(window)) {
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        glDrawPixels(100, 100, GL_RGB, GL_UNSIGNED_BYTE, data);
+        
+        glfwSwapBuffers(window);
+
+        glfwWaitEvents();
+
+    }
+
+    return 0;
+
+}
+