Added some themes.

theme/Arduino-Themes-master/README.md

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+# Arduino Themes
+A collection of themes for the Arduino IDE. Installation is full manual. Read this https://thecustomizewindows.com/2017/10/change-theme-font-syntax-highlighting-arduino-ide/
+
+Monkai :
+
+![ArduinoThemes1](https://raw.github.com/technobly/MonokaiArduinoTheme/master/screenshot.png)
+
+DarkIce :
+
+![ArduinoThemes2](https://raw.githubusercontent.com/AbhishekGhosh/Arduino-Themes/master/Venom791-DarkIce/screenshot.PNG)
+
+DarkArduino :
+
+![screenshot](https://raw.githubusercontent.com/jeffThompson/DarkArduinoTheme/master/screenshot.png)
+
+Update :
+
+Also look at :
+
+1. Dracula : https://draculatheme.com/arduino-ide and https://github.com/dracula/arduino-ide 
+2. Dark theme : https://github.com/taunoe/arduino-dark-theme
+
+
+#### Installation
+- Back up your current theme by rename the folder **{Arduino IDE 
+installation folder}/lib/theme** to **theme.original** or any other 
+convenient name.Mac users should look in 
+`~/Applications/Arduino.app/Contents/Java/lib` and Windows users should 
+look in `C:\Program Files (x86)\Arduino\lib`.
+- PREFERENCES.TXT : On Windows, located here: 
+`%AppData%\Roaming\Arduino`, on Mac located here: 
+`~/Applications/Arduino.app/Contents/Java/lib` 
+- Download the desired theme from the download link on the list above.
+- Copy the theme folder from the downloaded file to **{Arduino IDE 
+installation folder}/lib**.
+- Restart the Arduino IDE if it's running.
+
+
+#### Acknowledgments
+I have not created the themes. I only collected them for personal usage. 
+Most are from Arduino Forum, few are from Github. The theme directories 
+are named with AuthorName--ThemeName convention. 
+
+- [Jeff Thompson](https://github.com/jeffThompson/DarkArduinoTheme), 
+also see [DarkProcessing 
+v3.0](https://github.com/jeffThompson/DarkProcessingTheme_3.0)
+- [technobly](https://github.com/technobly/MonokaiArduinoTheme)
+