add test case for camera and audio (cocos#1)

* add test case for camera and audio

* add volume control

assets/cases/audio.meta

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assets/cases/audio/1.C(do).mp3.meta

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assets/cases/audio/2.D(re).mp3.meta

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assets/cases/audio/3.E(mi).mp3.meta

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assets/cases/audio/4.F(fa).mp3.meta

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assets/cases/audio/5.G(sol).mp3.meta

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assets/cases/audio/6.A(la).mp3.meta

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assets/cases/audio/7.B(si).mp3.meta

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+  ],
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+}

assets/cases/audio/AudioController.ts

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+import { _decorator, Component, AudioClip, AudioSourceComponent, LabelComponent, SliderComponent } from "cc";
+const { ccclass, property } = _decorator;
+
+@ccclass("AudioController")
+export class AudioController extends Component {
+    /* class member could be defined like this */
+    // dummy = '';
+
+    /* use `property` decorator if your want the member to be serializable */
+    // @property
+    // serializableDummy = 0;
+
+    @property({type: [AudioClip]})
+    public clips: AudioClip[] = [];
+
+    @property({type: AudioSourceComponent})
+    public audioSource: AudioSourceComponent = null;
+
+    @property({type: LabelComponent})
+    public nameLabel: LabelComponent = null;
+
+    start () {
+        // Your initialization goes here.
+    }
+
+    // update (deltaTime: number) {
+    //     // Your update function goes here.
+    // }
+
+    onButtonClicked(event, index: number) {
+        let clip: AudioClip = this.clips[index];
+        this.nameLabel.string = clip.name;
+        this.audioSource.playOneShot(clip);
+    }
+
+    onVolumeSliderChanged(eventTarget: SliderComponent) {
+        this.audioSource.volume = eventTarget.progress;
+    }
+}

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assets/cases/audio/BlackButton.prefab

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assets/cases/audio/BlackButton.prefab.meta

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