Added a README

Author: YellowAfterlife

README.md

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+# display_mouse_sim
+Minimalistic mouse automation functions.
+
+## Functions
+
+- **display_mouse_button_press(button)**  
+  Presses the given mouse button (analogous to `keyboard_key_press`)
+- **display_mouse_button_release(button)**  
+  Releases the given mouse button (analogous to `keyboard_key_release`)
+- **display_mouse_button_check_direct(button)**  
+  Checks if the given mouse button is currently held down (analogous to `keyboard_check_direct`)
+- **display_mouse_wheel_scroll(amount)**  
+  Sends a scroll wheel event.  
+  Usually, amount of `120` is one scroll up and `-120` is one scroll down, but you may find that many applications don't actually care about amount at all, only the direction.
+
+## Meta
+
+**Author:** [YellowAfterlife](https://github.com/YellowAfterlife)  
+**License:** MIT