Merge pull request #226 from prawnzyy/master

Update documentation

docs/DeveloperGuide.md

@@ -206,6 +206,8 @@ Step 10. A `RecipeAddCommand` instance is created by the `RecipeAddCommandParser
 
 Step 9. The `RecipeAddCommand` adds the new `Recipe` instance to the recipe list in `ModelManager`.
 
+<div style="page-break-after: always;"></div>
+
 The following sequence diagram shows how the add recipe operation works:
 ![img.png](img.png)
 
@@ -586,6 +588,26 @@ Priorities: High (must have) - `***`, Medium (nice to have) - `**`, Low (unlikel
 - 2c. There are currently no recipes stored
   - No updates will be made to the screen
 
+#### Use case: Add a new recipe
+#### MSS
+1. User requests to start adding a recipe
+2. User enters the name of the recipe
+3. User enters the ingredients of the recipe
+4. User enters command to move to the steps portion
+5. User enters the steps of the recipe
+6. User enters command to finalise the add recipe command
+7. [Ba]king [Br]ead adds the recipe to the recipe list
+
+    Use case ends
+
+#### Extensions:
+- 2a. Name is not of alphanumeric format
+  - [Ba]king [Br]ead shows an error message
+- 3a. Ingredient inputted does not follow given format
+  - [Ba]king [Br]ead shows an error message
+- 5a. Step inputted does not contain an index at the start
+  - [Ba]king [Br]ead shows an error message
+
 #### Use case: Search for a recipe with a specific ingredient
 #### MSS
 1. User requests to search for recipes with a specific ingredient

docs/UserGuide.md

@@ -230,6 +230,9 @@ complete recipe
 * For the recipe steps, the format to follow is `(index). (step)` where an example is `1. Mix Water and Flour`.
 * For the recipe steps, you have to remember the index of step you are typing in and check it by yourself.
 
+**Note**: There is no error message when inputting negative quantities for ingredients. As such, it is up to the user to ensure
+          that a positive quantity is inputted.
+
 Example:
 ```
 addrecipe