Added Windows with Cygwin install documentation

Not completely tested due to Windows update madness

docs/install.md

@@ -2,7 +2,7 @@
 
 ## Debian/Ubuntu
 ```sh
-sudo apt-get install libclang-dev make cmake g++ git
+sudo apt-get install git cmake make g++ libclang-dev
 ```
 
 ```sh
@@ -25,3 +25,22 @@ cmake .
 make
 make install
 ```
+
+## Windows with Cygwin (https://www.cygwin.com/)
+Install https://github.com/transcode-open/apt-cyg:
+```sh
+lynx -source rawgit.com/transcode-open/apt-cyg/master/apt-cyg > apt-cyg
+install apt-cyg /bin
+```
+
+```sh
+apt-cyg install git cmake make gcc-g++ libclang
+```
+
+```sh
+git clone https://github.com/cppit/libclangmm.git
+cd libclangmm
+cmake .
+make
+make install
+```