完善功能

uni_modules/hao-camera/readme.md

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+# hao-camera 证件照相机拍照
+
+**示例使用方法**
+
+```
+<template>
+	<!-- <@devicePosition: 摄像头位置	前置或后置摄像头，值为front, back
+	@quality: 成像质量，值为high（高质量）、normal（普通质量）、low（低质量） -->
+    <view>
+        <hao-camera
+            :devicePosition="back"
+            :quality="high"
+            @confirmPhoto="confirmPhoto"
+        ></hao-camera>
+    </view>
+</template>
+
+<script>
+	import haoCamera from '@/uni_modules/hao-camera/components/hao-camera/hao-camera.vue';
+	export default {
+		components: {
+		    haoCamera
+		},
+		methods: {
+			confirmPhoto(filePath){
+				console.log('图片: ' + filePath);
+			}
+		}
+	}
+</script>
+```
+