Add readme

README.md

+# Upload2Online Installer (Windows) 
+This is the windows installer for the upload2online data uploader: https://gitlab.elettra.eu/spe/util/datauploader/upload2online
+
+## Usage
+* Download the [zip](https://gitlab.elettra.eu/spe/util/datauploader/upload2online/-/archive/master/upload2online-master.zip) (or any other archive)
+* Extarct it
+* Right-click on the `installer.bat` file and click on "Run as Administrator"
+* Wait :)
+
+## Known problems
+
+### On Windows 8.1
+- Bluetooth API error caused by PyQt5
+
+  ![alt text](image.png)
+
+  > `Fix`  Go to the python installation path rename this dll `...\Lib\site-packages\PyQt5\(Qt5|Qt)\bin\Qt5Bluetooth.dll` to something like this `_Qt5Bluetooth.dll`
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