Added some themes.

theme/Arduino-Themes-master/docs/index.rst

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+# Arduino Themes
+A collection of themes for the Arduino IDE. Installation is full manual. 
+Read this [Arduino Font Installation](https://thecustomizewindows.com/2017/10/change-theme-font-syntax-highlighting-arduino-ide/)
+
+#### 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. 
+ 
+