Create README.md

Author: atiksoftware

examples/SFML/README.md

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+# Create SFML Overlay Transparent Window
+Create a window as transparent background and ctopmost and unclickable window form.
+
+```c++
+sf::RenderWindow window;
+
+sf::ContextSettings settings;
+settings.antialiasingLevel = 8;
+
+
+window.create(sf::VideoMode(screen_width, screen_height), "Amiral Router", sf::Style::None, settings);
+
+window.setFramerateLimit(120); 
+
+window.setVerticalSyncEnabled(false);
+
+HWND hWnd = window.getSystemHandle();
+
+SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
+SetLayeredWindowAttributes(hWnd, 0, 255, LWA_ALPHA);
+
+MARGINS margin = { -1 };
+DwmExtendFrameIntoClientArea(hWnd, &margin);
+
+::SetWindowPos(hWnd, HWND_TOPMOST, 1,1, screen_width, screen_height, SWP_SHOWWINDOW);
+UpdateWindow(hWnd);
+```