fixed dev guidelines

Development Guidelines.md

@@ -2,18 +2,25 @@
 
 2.Clearly declare "private" inside of class. For example:
 
-use class item{
+use 
+```c++
+class item{
     private:
     int price;
     public:
     getPrice();
 }
+```
 
-instead of class item{
+instead of class
-    int price
+ 
+```c++
+class item{
+    int price;
     public:
-    getprice();
+    getPrice();
 }
+```
 
 
 3.Declare inheritance type(public, private, protected) when using inheritance.

README.md

@@ -1,3 +1,3 @@
 # Shoppe-Manne
 
-Basic shop management system written in
+Basic shop management system written in c++