Add a framework search path for Carthage (#189)

* Add a framework search path for Carthage

* Update docs for Carthage

Author: kadikraman

README.md

@@ -221,7 +221,11 @@ AppAuth supports three options for dependency management.
 
        github "openid/AppAuth-iOS" "master"
 
-   Then run `carthage bootstrap`.
+   Then run `carthage update --platform iOS`.
+
+   Drag and drop `AppAuth.framework` from `ios/Carthage/Build/iOS` under `Frameworks` in `Xcode`.
+
+   Add a copy files build step for `AppAuth.framework`: open Build Phases on Xcode, add a new "Cope Files" phase, choose "Frameworks" as destination, add `AppAuth.framework` and ensure "Code Sign on Copy" is checked.
 
 3. **Static Library**
 

ios/RNAppAuth.xcodeproj/project.pbxproj

@@ -207,6 +207,7 @@
 		58B511F01A9E6C8500147676 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				FRAMEWORK_SEARCH_PATHS = "$(SRCROOT)/../../../ios/Carthage/build/iOS";
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
@@ -225,6 +226,7 @@
 		58B511F11A9E6C8500147676 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				FRAMEWORK_SEARCH_PATHS = "$(SRCROOT)/../../../ios/Carthage/build/iOS";
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,