Added Cygwin Build README and patch

README-Cygwin.md

+### Installation on Windows
+To use telegram-cli in Windows, you should compile with Cygwin which has POSIX API functionality.
+
+First, Clone GitHub Repository
+
+     git clone --recursive https://github.com/vysheng/tg.git
+
+Install [Cygwin](https://www.cygwin.com/) and cygwin's package manager, [apt-cyg](https://github.com/transcode-open/apt-cyg).
+
+On Cygwin Terminal, install compiler and tools :
+
+     apt-cyg install cygwin32-gcc-core cygwin32-gcc-g++ gcc-core gcc-g++ make wget patch diffutils grep tar gzip
+
+Now you have a compiler, but no libraries. You need readline, openssl, libconfig, liblua, python and libjansson to use telegram-cli's full functionality.
+
+On Cygwin Terminal, type: 
+
+     apt-cyg install libevent-devel openssl-devel libreadline-devel lua-devel python3
+(Install package 'python' to use Python 2.7, or install package 'python3' to use Python 3)
+
+libconfig and libjansson is not in cygwin's package, so you should compile yourself.
+
+Compile libconfig :
+     
+     wget http://www.hyperrealm.com/libconfig/libconfig-1.5.tar.gz
+     tar xvf libconfig-1.5.tar.gz && cd libconfig-1.5
+     ./configure
+     make && make install && cd ..
+
+Compile libjansson :
+
+     wget http://www.digip.org/jansson/releases/jansson-2.7.tar.gz
+     tar xvf jansson-2.7.tar.gz && cd jansson-2.7
+     ./configure
+     make && make install && cd ..
+
+Then, in telegram-cli's directory,
+
+     ./configure
+     
+We need to patch Makefile and loop.c to compile in cygwin. Download this [diff](https://gist.github.com/ied206/d774a445f36004d263ab) then untar. Then, patch in 'tg' directory.
+
+     cd tg
+     patch -p1 < telegram-cli-cygwin.diff
+
+Then
+     make
+
+There will be some warnings, but you can ignore them. After compile is done, **telegram-cli.exe** will be generated in **bin** directory.
+
+To run telegram-cli, type
+     
+     bin/telegram-cli -k tg-server.pub
+
+**Caution**: Binary compiled with Cygwin should be run in Cygwin Terminal, since it assumes unix-like shell, and it is dependent on cygwin dlls.

telegram-cli-cygwin.diff

+diff -urN telegram-cli/Makefile telegram-cli-mod/Makefile
+--- telegram-cli/Makefile	2015-06-16 00:15:06.735779700 +0900
++++ telegram-cli-mod/Makefile	2015-06-16 00:17:10.884076800 +0900
+@@ -4,9 +4,9 @@
+ LDFLAGS= -L/usr/local/lib -L/usr/lib -L/usr/lib -L/usr/lib
+ CPPFLAGS= -I/usr/local/include -I/usr/include -I/usr/include  -I/usr/include/python3.4m -I/usr/include
+ DEFS=-DHAVE_CONFIG_H
+-COMPILE_FLAGS=${CFLAGS} ${CPFLAGS} ${CPPFLAGS} ${DEFS} -Wall -Werror -Wextra -Wno-missing-field-initializers -Wno-deprecated-declarations -fno-strict-aliasing -fno-omit-frame-pointer -ggdb -Wno-unused-parameter -fPIC
++COMPILE_FLAGS=${CFLAGS} ${CPFLAGS} ${CPPFLAGS} ${DEFS} -Wall -Wextra -Wno-missing-field-initializers -Wno-deprecated-declarations -fno-strict-aliasing -fno-omit-frame-pointer -ggdb -Wno-unused-parameter -fPIC
+ EXTRA_LIBS=-ljansson -lconfig -lz -levent -lm   -lreadline -llua-5.2  -lpython3.4m -lssl -lcrypto
+-LOCAL_LDFLAGS=-rdynamic -ggdb -levent ${EXTRA_LIBS} -ldl -lpthread -lutil
++LOCAL_LDFLAGS=-ggdb -levent ${EXTRA_LIBS} -ldl -lpthread -lutil
+ LINK_FLAGS=${LDFLAGS} ${LOCAL_LDFLAGS}
+ 
+ DEP=dep
+diff -urN telegram-cli/loop.c telegram-cli-mod/loop.c
+--- telegram-cli/loop.c	2015-06-16 00:13:58.813146200 +0900
++++ telegram-cli-mod/loop.c	2015-06-16 00:17:40.441832400 +0900
+@@ -383,8 +383,8 @@
+   close (auth_file_fd);
+ }
+ 
+-void write_secret_chat (tgl_peer_t *_P, void *extra) {
+-  struct tgl_secret_chat *P = (void *)_P;
++void write_secret_chat (tgl_peer_t *_PP, void *extra) {
++  struct tgl_secret_chat *P = (void *)_PP;
+   if (tgl_get_peer_type (P->id) != TGL_PEER_ENCR_CHAT) { return; }
+   if (P->state != sc_ok) { return; }
+   int *a = extra;