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Explained new inputs in the README

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README.md
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@ -68,14 +68,27 @@ The screen has a resolution of $256*256=2^{16}$ pixels. The color of each pixel
### Input
The only supported inputs are the mouse position and the left and right mouse keys.
The only supported inputs are the mouse position and a list of eight keys.
These keys are supposed to represent the face buttons of an NES controller.
The codes for the **A** and **B** keys also represent the left and right mouse buttons.
On synchronization the input on the last frame is loaded into the input-buffer.
On synchronization the new input is loaded into the input-buffer.
The *position code* is the index of the pixel, the mouse is currently on.
The *key code* is given by left_mouse+2*right_mouse. So it can have the values 0 1 2 or 3.
The *key code* uses bitflags. We count from the least significant bit.
|Bit|Input Name|Mapping in reference emulator|
|-| -|-|
|0|**A** / Mouse Left| **Space** / Mouse Left|
|1|**B** / Mouse Right| **B** / Mouse Right|
|2|**Up** | **Up** / **W**|
|3|**Down** | **Down** / **S**|
|4|**Left** | **Left** / **A**|
|5|**Right** | **Right** / **D**|
|6|**Select** | **N**|
|7|**Start** | **M**|
There is no guarantee that the inputs are synced on the next frame. Before the first synchronization, the input codes are zero.
### Synchronization