Added the linear search algorithm example

SearchingAlgorithms/Linear_Search.py

@@ -1 +1,33 @@
 
+def linear_search(all_items, item):
+    """Searches an item inside an iterable using the
+    linear search algorithm.
+
+    Positional Arguments:
+    all_items -- an iterable of items to search
+    item      -- the item to find
+    """
+    for index, element in enumerate(all_items):
+        if element == item:
+            return index
+    else:
+        return -1
+
+
+import random
+
+# Generating a random list with 25 integers
+my_list = [ random.randint(0, 100) for _ in range(25) ]
+print("List: ", my_list)
+
+# Reading the number to find in list
+item_to_find = int(input("Type the number to find: "))
+
+# Executing the linear search algorithm
+found_index = linear_search(my_list, item_to_find)
+
+# Printing the results
+if found_index > -1:
+    print("The {} was found at position {}!".format(item_to_find, found_index))
+else:
+    print("The {} wasn't found!".format(item_to_find))