Added challege in for loop

challenges/7.1.Loops/lesson.md

@@ -36,3 +36,27 @@ else:
 **_Instructions_**
 **Modify the count, so that condition and switch_loop must become true.**
 **Use else statement, to mark the end of a program and switch switch_end to value true.**
+## Loops (For)
+- https://docs.python.org/3/tutorial/controlflow.html
+
+
+The syntax of a for loop is:
+suppose you want to print 5 numbers from  0 to 5 then code is here
+```
+for i in range(6):
+   print(i)
+```
+range can have 3 arguments range(starting value,ending value,increment)
+if we specify range(0,5,1)
+then it will go from 0 to 5-1
+it will print 0 1 2 3 4
+if there is increment of 2
+then 0 2 4
+```
+for i in range(i,r,e):
+   print(i)
+```
+
+**_Instructions_**
+**Modify the values of i,r,e so that it print first 5 multiples of 5**
+