Add readme

README.md

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+# EEC IV Reader GUI
+
+GUI for the EEC IV Reader: https://github.com/flxkrmr/eec-iv-reader-arduino
+
+Download Installer https://github.com/flxkrmr/eec-iv-reader-gui/releases/latest
+
+Tested on Windows 10.
+
+## Usage
+
+When GUI ist started, connect Reader with USB and press "Connect". The Reader should restart on connection. Then select a mode on the Reader. The GUI will show when a reading has started and display the results.
+
+## Commands
+### Local startup
+```
+npm install
+npm run start
+```
+### Creating installer
+```
+npm run make
+```
+### Publish Release draft to Github
+```
+set GITHUB_TOKEN=xxx
+npm run publish
+```