revised a readme.md in human_existence_detector (#1412)

* add two cases of haas506

* have repaired  picture-displayed errors of two cases of haas506

* upload a case of haas506 named rc522_write_read

* upload a case of haas506 named lbs_demo

* upload a case for haas506 named air-detector

* revised a readme.md in human_existence_detector
Co-authored-by: NskylarCai <75605680+skylarCai@users.noreply.github.com>

.vscode/settings.json

+{
+    "haasStudio.appType": "c",
+    "haasStudio.name": "",
+    "haasStudio.hardware.board": "haaseduk1"
+}
\ No newline at end of file

.vscode/tasks.json

+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "haas-studio: Config",
+      "type": "shell",
+      "command": "aos",
+      "args": [
+        "make",
+        "@haaseduk1",
+        "-c",
+        "config"
+      ],
+      "presentation": {
+        "focus": true
+      }
+    },
+    {
+      "label": "haas-studio: Make",
+      "type": "shell",
+      "command": "aos",
+      "args": [
+        "make"
+      ],
+      "presentation": {
+        "focus": true
+      }
+    },
+    {
+      "label": "haas-studio: Burn",
+      "type": "shell",
+      "command": "aos",
+      "args": [
+        "burn"
+      ],
+      "presentation": {
+        "focus": true
+      }
+    },
+    {
+      "label": "haas-studio: Serial Monitor",
+      "type": "shell",
+      "command": "aos",
+      "args": [
+        "monitor",
+        "",
+        "1500000"
+      ],
+      "presentation": {
+        "focus": true,
+        "panel": "dedicated"
+      }
+    },
+    {
+      "label": "haas-studio: Clean",
+      "type": "shell",
+      "command": "aos",
+      "args": [
+        "make",
+        "clean"
+      ],
+      "presentation": {
+        "focus": true
+      }
+    },
+    {
+      "label": "dummy_aos3.3.0",
+      "command": "pwd"
+    }
+  ],
+  "windows": {
+    "options": {
+      "env": {
+        "PATH": "C:\\ProgramData\\aos\\miniconda3;C:\\ProgramData\\aos\\miniconda3\\Scripts;C:\\ProgramData\\aos\\miniconda3\\Library\\bin;${env:PATH}"
+      }
+    }
+  }
+}

haas_lib_bundles/python/docs/examples/human_existence_detector/haas506/README.md

+
 # 人体存在传感器
 
 
@@ -60,22 +61,27 @@
 </table>
 <br>
 
+
 ## 2.准备
+
 （1）硬件器材
 1. HaaS 506开发板一套
 2. 5.8G雷达感应传感器模块一个
 3. 连接线若干
+
 <br>
 
 
 
 （2）硬件模块接线
+
 <div align="center">
 <img src=./../../../images/haas506案例图片/haas506_雷达人体检测.jpg width=80%/>
 </div>
 <br>
 
 
+
  （3）将音频文件放置于当前工程文件夹内
 <br>
 <div align="center">
@@ -135,7 +141,6 @@ no body
 no body
 no body
 detect body
+
 ......
 ```
-
-