add INSTALL.md

INSTALL.md

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+#依赖项
+1. [FreeSWITCH](http://files.freeswitch.org/freeswitch-1.0.6.tar.gz)
+2. [OpenSIPS](http://opensips.org/pub/opensips/1.8.5/src/opensips-1.8.5_src.tar.gz/) (可选)
+3. [boost](http://sourceforge.net/projects/boost/files/boost/1.56.0/boost_1_56_0.tar.gz/download)
+4. [json-c](https://github.com/json-c/json-c/archive/json-c-0.10-20120530.tar.gz)
+5. [libxml2](http://xmlsoft.org/sources/old/libxml2-2.6.30.tar.gz)
+6. [mysql](http://downloads.mysql.com/archives/get/file/mysql-5.0.51b.tar.gz)
+7. [pcre](http://sourceforge.net/projects/pcre/files/pcre/7.7/pcre-7.7.tar.gz/download)
+8. [libcurl](http://curl.haxx.se/download/curl-7.21.0.tar.gz)
+
+
+#编译
+- ` $ bash build.sh build `
+- 目录**release**目录下有**ims**、**acd**、**agentproxy**、**ivr**、**freeswitch**四个目录，每个目录下有独立的可执行程序