Core examples (#11)

* Added core_input_keys example

* Added core_basic_window example

* Added core_input_mouse example

* Added core_input_mouse_wheel example

examples/core/core_basic_window.py

@@ -0,0 +1,41 @@
+"""
+
+raylib [core] example - Basic window
+
+"""
+from raylib.pyray import PyRay
+from raylib.colors import (
+    RAYWHITE,
+    LIGHTGRAY,
+)
+
+
+pyray = PyRay()
+
+
+# Initialization
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 450
+
+pyray.init_window(SCREEN_WIDTH, SCREEN_HEIGHT,
+                  'raylib [core] example - basic window')
+pyray.set_target_fps(60)  # Set our game to run at 60 frames-per-second
+
+
+# Main game loop
+while not pyray.window_should_close():  # Detect window close button or ESC key
+    # Update
+    # TODO: Update your variables here
+
+    # Draw
+    pyray.begin_drawing()
+
+    pyray.clear_background(RAYWHITE)
+    pyray.draw_text(
+        'Congrats! You created your first window!', 190, 200, 20, LIGHTGRAY)
+
+    pyray.end_drawing()
+
+
+# De-Initialization
+pyray.close_window()  # Close window and OpenGL context