fix README and delete unwanted XML files

Signed-off-by: gaohui <gaohui34@huawei.com>

AI/AIFunctionSet/README_en.md

@@ -25,8 +25,3 @@
     \* Entity recognition: Extracts entities with specific meanings from natural languages and performs related operations \(such as searching\) based on the extracted entities.
 
     \* Automatic speech recognition \(ASR\): Converts audio files and real-time audio data streams into Chinese character sequences at a recognition accuracy of over 90% \(95% for local recognition\).
-
--   Licensing
-
-For details, see the LICENSE.
-

AI/AIFunctionSet/README_zh.md

@@ -14,5 +14,3 @@ AI
 * 关键字提取: 可以在大量信息中提取出文本想要表达的核心内容，可以是具有特定意义的实体，如：人名，地点，电影等。也可以是一些基础但是在文本中很关键的词汇。
 * 实体识别: 从自然语言中提取出具有特定意义的实体，并在此基础上完成搜索等一系列相关操作及功能。
 * 语音识别: 将语音文件、实时语音数据流转换为汉字序列，准确率达到90%以上（本地识别95%）。
-
-## Licensing

AI/AIFunctionSet/entry/src/main/resources/base/graphic/background_ability_main.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-<shape xmlns:ohos="http://schemas.huawei.com/res/ohos"
-       ohos:shape="rectangle">
-    <solid
-        ohos:color="#FFFFFF"/>
-</shape>

AI/AIFunctionSet/entry/src/main/resources/base/layout/ability_main.xml

@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<DirectionalLayout
-    xmlns:ohos="http://schemas.huawei.com/res/ohos"
-    ohos:height="match_parent"
-    ohos:width="match_parent"
-    ohos:alignment="center"
-    ohos:orientation="vertical">
-
-    <Text
-        ohos:id="$+id:text_helloworld"
-        ohos:height="match_content"
-        ohos:width="match_content"
-        ohos:background_element="$graphic:background_ability_main"
-        ohos:layout_alignment="horizontal_center"
-        ohos:text="$string:mainability_HelloWorld"
-        ohos:text_size="40vp"
-        />
-
-</DirectionalLayout>