Update README.md

README.md

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-screenzap
+Screenzap is a screenshot tool for Windows with similar behavior to the MacOS screenshot feature. It has configurable keyboard shortcuts, and an option to start when logged in.
+
+## Installation
+
+Just put Screenzap.exe where you want it. Run it. nbd.
+
+## Usage
+
+Press the configured shortcut (default is `ctrl-alt-shift-4`), drag to select a screen region, and take your screenshot. It will go on the clipboard.
+
+### Modifier keys
+
+* Shift -- make selection square
+* Space -- move selection rectangle
+* Alt -- draw from center of selection (bit wonky)
+
+## Todos and known issues
+
+* Holding Shift and Alt simultaneously doesn't work
+* Not all surfaces will get captured
+* What You See Isn't Quite What You'll Get -- some visual elements, like context menus, will not always get captured
+* DPI awareness is experimental and only Works On My Machine. Bug reports and PR:s welcome!
+* Only puts Bitmap data on the clipboard. Some applications, like Blender, expects PNG.