In order to compile projects on the ESP 12E, obtain the libraries for the board.
Preferences -> Settings -> Additional Boards Manager URLs. Enter in the box: http://arduino.esp8266.com/stable/package_esp8266com_index.json
Then Tools -> Boards - > Board Manager and search for esp8266. Find esp8266 by ESP8266 Community.
It is recommended to set board settings according to the image on the right
In order to run the Visual Studio C# Application, the following packages are required. To obtain, in Visual Studio, Project -> Manage NuGet Packages... then search for and install: