add data types for creating shopping cart

2-js-basics/1-data-types/assignment.md

@@ -6,6 +6,14 @@ Imagine you are building a shopping cart. Write some documentation on the data t
 
 ## Rubric
 
+### Data types 
+
+1. Array - we will use it to add items to shopping cart.
+2. Number - this type help as to count amounce of items in shopping cart.
+3. String - help us to write the names of prodacts.
+4. Booleans - to know is the shopping cart empty.
+5. Null - to initialise variable for counting items in shopping cart.
+
 Criteria | Exemplary | Adequate | Needs Improvement
 --- | --- | --- | -- |
 ||The six data types are listed and explored in detail, documenting their use|Four datatypes are explored|Two data types are explored|