Added README for building the add/remove turbo applications in Windows

cpp/README.md

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+# Building for Windows
+
+## Installing and Configuration Cygwin
+
+1. Download Cygwin from https://www.cygwin.com/setup-x86_64.exe
+2. Execute downloaded install executable
+3. Select Yes when prompted by User Account Control
+4. Click `Next`
+5. Select `Install from Internet` and click `Next`
+6. Leave `Root Install Directory` alone and click `Next`
+7. Leave `Select Local Package Directory` alone and click `Next`
+8. Leave `Select Your Internet Connection` alone and click `Next`
+9. Select a mirror and click `Next`
+10. From the `View` dropdown select `Full`
+11. Enter `gcc-g++` in the `Search` box and select `11.3.0-1` in the `New` column for the `gcc-g++` row
+13. Enter `autoconf` in the `Search` box and select `15-1` in the `New` column for the `autoconf` row
+14. Enter `automake` in the `Search` box and select `11-1` in the `New` column for the `automake` row
+15. Enter `make` in the `Search` box and select `4.4.1-2` in the `New` column for the `make` row
+16. Enter `git` in the `Search` box and select `2.39.0-1` in the `New` column for the `git` row
+17. Enter `wget` in the `Search` box and select `1.21.3-1` in the `New` column for the `wget` row
+18. Click `Next` at the bottom right of the window
+19. Click `Next` at the `Review and confirm changes` window
+20. Click `Finish` to close the window
+
+## Updating Windows PATH
+
+1. Click on the Start menu
+2. Type `PATH`
+3. Select `Edit the system environment variables`
+4. A new window called `System Properties` should come up
+5. Click `Environment Variables` button
+6. In the top panel click the `Path` button
+7. In the new window click the `Edit` button
+8. In the new window click the `New` button
+9. Type in `C:\cygwin64\bin`
+10. Click `OK` to close the edit window
+11. Click `OK` to close the `Environment Variables` window
+12. Click `OK` to close the `System Properties` window
+13. At this point you might have to reboot the computer, but sometimes you don't have to
+
+## Building the Turbo decode/encode executables
+
+1. Open the Cygwin terminal (should be on your desktop, search the start menu if not)
+2. Navigate to where you have extracted/cloned the `dji_droneid` repo in Windows
+   If you have the code at `C:\Users\<user_name>\Downloads\dji_droneid` then you would run: `cd /cygdrive/c/Users/<user_name>/Downloads/dji_droneid` in the Cygwin terminal
+3. Run the following set of commands in the Cygwin terminal
+```
+pushd cpp
+wget https://raw.githubusercontent.com/d-bahr/CRCpp/master/inc/CRC.h -O CRC.h
+mkdir -p deps; pushd deps
+git clone https://github.com/ttsou/turbofec; pushd turbofec
+autoreconf -i && ./configure && make && make install
+popd && popd
+g++ -Wall add_turbo.cc -o add_turbo -I. -I/usr/local/include -L/usr/local/lib -lturbofec
+g++ -Wall remove_turbo.cc -o remove_turbo -I. -I/usr/local/include -L/usr/local/lib -lturbofec
+```
+
+You should now have two new executables: `add_turbo` and `remove_turbo`
+
+These executables should be usable from Windows