Can You sent request to add your library into arduino libraries so it will be discoverable by others users
https://github.com/arduino/Arduino/issues
since as i see u've made proper library files etc so its worth to add it for easier instalation. Before u sent a rewuest please move OLED.cpp and OLED.h into src directory.
Of course i can also copy your repository and add it from my github account if u dont mind ?