add 3.1 part files

Author: Tom Cheung

1.Shopping/1.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	cout << 7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6 << endl;
+	return 0;
+}

1.Shopping/1.js

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+console.log(7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6)

1.Shopping/1.py

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+print(7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6)

README.md

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+# Programming
+The project is created to learning *Javascript* and *Python3*, but beginning with C++ on [Tsinghua X_2015_T2](http://www.xuetangx.com/courses/course-v1:TsinghuaX+30240233X_2015_T2+sp/info), I wrote down the notes reference from [MichaelLiao](https://www.liaoxuefeng.com/) and some demos during learning to review later!      
+
+*Text editor*：1. [Dev-C++](https://sourceforge.net/projects/orwelldevcpp/) 2. [Visual Studio Code](https://code.visualstudio.com/) 3. [Notepad ++](https://notepad-plus-plus.org/download/v7.5.3.html)
+## Ⅰ. Knowledge Point      
+### 1. *C++*
+### 2. *Javascript*
+### 3. *Python3*   
+#### Tips:
+##### 1. Make sure that *Tab = 4 Backspace*.
+##### 2. Python program is *sensitive* to case.
+## Ⅱ. Demos
+### 1/33. Shopping
+  Description:       
+  
+                           |    *price*    >>> *amount*
+               *Tomatos*   | ￥7.9 yuan/kg >>>  0.8kg
+               *Eggs*      | ￥9.5 yuan/kg >>>  1.5kg
+               *Cucumbers* | ￥8.7 yuan/kg >>>  0.6kg
+               
+   Question: How much the total vegetables?
+   
+#### *C++* edition
+
+ ```
+#include <iostream>
+using namespace std;
+
+int main()
+{
+	cout << 7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6 << endl;
+	return 0;
+}
+  ```
+     
+#### *Python3* edition   
+
+  ```
+print(7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6)
+  ```   
+     
+#### *Javascript* edition   
+ 
+  ```
+  console.log(7.9 * 0.8 + 9.5 * 1.5 + 8.7 * 0.6)
+  ```   
+     
+### 2/33.