添加IMSDK

+Pod::Spec.new do |s|
+  s.name = "IMSDK"
+  s.version = "2.5.6.11082.11081"
+  s.summary = "腾讯云-云通信"
+  s.description = <<-DESC
+  腾讯云-云通信
+  DESC
+  s.homepage = "https://www.qcloud.com/document/product/269/1565"
+  s.license = "MIT"
+  s.author = {"undancer" => "undancer@gmail.com"}
+  s.platform = :ios, "7.0"
+  s.source = {:http => "http://127.0.0.1:8080/IMSDK_2.5.6.11082.11081.zip", :sha1 => "4bd56f229194269e312297f8e725e02edcb9a545" }
+  s.vendored_frameworks = "IMSDK/IMCore.framework", "IMSDK/ImSDK.framework", "IMSDK/QALSDK.framework", "IMSDK/IMSDKBugly.framework", "IMSDK/TLSSDK.framework"
+  s.frameworks = "CoreTelephony", "SystemConfiguration"
+  s.libraries = "c++", "z", "sqlite3"
+  s.requires_arc = true
+end