cleaned up top-level readme
cleaned up top-level readme

GoogleCloudPlatform/ios-docs-samples,akashsinghal/Speech-Memorization-App,akashsinghal/Speech-Memorization-App,akashsinghal/Speech-Memorization-App,timburks/ios-docs-samples,timburks/ios-docs-samples,akashsinghal/Speech-Memorization-App,timburks/ios-docs-samples,akashsinghal/Speech-Memorization-App,timburks/ios-docs-samples,akashsinghal/Speech-Memorization-App,GoogleCloudPlatform/ios-docs-samples,akashsinghal/Speech-Memorization-App,akashsinghal/Speech-Memorization-App,GoogleCloudPlatform/ios-docs-samples,GoogleCloudPlatform/ios-docs-samples,akashsinghal/Speech-Memorization-App,timburks/ios-docs-samples,GoogleCloudPlatform/ios-docs-samples