added new snippet reverse_string

snippets/reverse_string.md

@@ -0,0 +1,18 @@
+---
+title: reverse_string
+
+tags: string,beginner
+---
+
+Returns the string after reversing it.
+
+Use string slicing to rotate the string.
+
+```py
+def reverse_string(string):
+  return string[::-1]
+```
+
+```py
+reverse_string("snippet") #"teppins" 
+```