Big update to README
Big update to README

Replaces standard methods for URL creation with BUO

BranchMetrics/android-branch-deep-linking,BranchMetrics/android-branch-deep-linking,BranchMetrics/Android-Deferred-Deep-Linking-SDK,BranchMetrics/Android-Deferred-Deep-Linking-SDK,BranchMetrics/Android-Deferred-Deep-Linking-SDK,BranchMetrics/android-branch-deep-linking,BranchMetrics/Android-Deferred-Deep-Linking-SDK,BranchMetrics/android-branch-deep-linking