Update readme

readme.md

@@ -31,8 +31,21 @@ Once created, load this environment with `source .venv/bin/activate` on Linux or
 ## Running the Program
 Run the program via `python ./main.py` while at the project root.
 
+Note: Items in the item set are defined by "total benefit" and "total weight/cost". Then the per-weight value of the
+item is calculated from this, via `total benefit / total cost`. The user only ever inputs "total benefit" and "total
+cost" values.
+
 ### Expected Output
-None so far.
+On launch, a UserInterface menu will start up.
+
+At all times, hitting option 1 should display knapsack variables.
+
+Option 2 will open a submenu to set/change these knapsack variables. Note that the "item set" can either be read in from
+a JSON file, or entered manually, item by item, through the console. Just select the correct option in the submenu for
+each.
+
+Finally, option 3 will solve for the given knapsack variables. Solutions are only output for an item set of 1 or more
+items, and a max weight greater than 0.
 
 
 ## Running Tests