add readme

.idea/workspace.xml

@@ -31,8 +31,8 @@
         <entry file="file://$PROJECT_DIR$/README.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="211">
-                <caret line="13" column="244" lean-forward="false" selection-start-line="13" selection-start-column="244" selection-end-line="13" selection-end-column="244" />
+              <first_editor relative-caret-position="139">
+                <caret line="43" column="0" lean-forward="true" selection-start-line="43" selection-start-column="0" selection-end-line="43" selection-end-column="0" />
                 <folding />
               </first_editor>
               <second_editor />
@@ -224,12 +224,12 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1525523789426</updated>
-      <workItem from="1525523790774" duration="246000" />
+      <workItem from="1525523790774" duration="312000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="246000" />
+    <option name="totallyTimeSpent" value="312000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="0" y="23" width="1440" height="828" extended-state="0" />
@@ -288,8 +288,8 @@
     <entry file="file://$PROJECT_DIR$/README.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="211">
-            <caret line="13" column="244" lean-forward="false" selection-start-line="13" selection-start-column="244" selection-end-line="13" selection-end-column="244" />
+          <first_editor relative-caret-position="139">
+            <caret line="43" column="0" lean-forward="true" selection-start-line="43" selection-start-column="0" selection-end-line="43" selection-end-column="0" />
             <folding />
           </first_editor>
           <second_editor />

README.md

@@ -24,17 +24,17 @@ If you have any problem while using C++ SDK, please join the **DingTalk group: 1
 
 	- Run the following commands on the Redhat/Fedora system to install third-party libraries.
 	```
-sudo dnf install libcurl-devel openssl-devel libuuid-devel libjsoncpp-devel
-```
+    sudo dnf install libcurl-devel openssl-devel libuuid-devel libjsoncpp-devel
+    ```
 	- Run the following commands on the Debian/Ubuntu system to install third-party libraries.
-	```
-sudo apt-get install libcurl4-openssl-dev libssl-dev uuid-dev libjsoncpp-dev
-```
+    ```
+    sudo apt-get install libcurl4-openssl-dev libssl-dev uuid-dev libjsoncpp-dev
+    ```
 2. Run the following commands to clone source codes from GitHub.
 
-```
-git clone https://github.com/aliyun/aliyun-openapi-cpp-sdk.git
-```
+    ```
+    git clone https://github.com/aliyun/aliyun-openapi-cpp-sdk.git
+    ```
 
 ## Use the C++ SDK