Add typings

Author: dolanmiu

my-typings/avs/speech-synthesizer/speech-finished.event.d.ts

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+// https://developer.amazon.com/docs/alexa-voice-service/speechsynthesizer.html#speechfinished
+declare namespace AVS {
+    namespace SpeechSynthesizer {
+        interface SpeechFinishedEvent extends AVS.EventMetadata {
+            payload: {
+                token: string;
+            };
+        }
+    }
+}

my-typings/avs/speech-synthesizer/speech-started.event.d.ts

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+// https://developer.amazon.com/docs/alexa-voice-service/speechsynthesizer.html#speechstarted
+declare namespace AVS {
+    namespace SpeechSynthesizer {
+        interface SpeechStartedEvent extends AVS.EventMetadata {
+            payload: {
+                token: string;
+            };
+        }
+    }
+}

my-typings/avs/speech-synthesizer/speech.directive.d.ts

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+// https://developer.amazon.com/docs/alexa-voice-service/speechsynthesizer.html#speak
+declare namespace AVS {
+    namespace SpeechSynthesizer {
+        interface SpeechDirective extends AVS.DirectiveMetadata {
+            payload: {
+                url: string;
+                format: string;
+                token: string;
+            };
+        }
+    }
+}