Add Visual Studio support

VisualStudio.md

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+# Getting started with GRBL_ESP32 in Visual Studio
+
+**!! Important !! There's a huge difference between Visual Studio and
+Visual Studio Code. This document is about Visual Studio, not Visual
+Studio Code!**
+
+First, get PlatformIO to work with Visual studio. The steps that
+need to be taken for this are the following:
+
+1. Install python. This is needed for both PlatformIO and for generating
+   the vcxproj file.
+2. From https://docs.platformio.org/en/latest/core/index.html#piocore
+   you should install the PlatformIO Core (CLI). Make sure you update
+   the command line search path.
+3. Use python to generate a vcxproj file: `python generate_vcxproj.py`.
+4. Start Grbl_Esp32.sln
+
+## Building
+
+Building is as easy as building your solution.
+
+## Uploading
+
+Uploading can be done from the command line using platformio. For
+example, run `platformio run --target upload --upload-port COM7`.
+For more details, see [the documentation of pio](https://dokk.org/documentation/platformio/v3.6.1/platforms/espressif32/).