Add instructions for adding locations

Author: samlawski

README.md

@@ -1,3 +1,37 @@
 # CODE World Campus
 
-A silly little text adventure. 
+A silly little text adventure. 
+
+## Adding a location
+
+Locations are organized in files. Each location is its own file. 
+
+You can add a location by following these steps: 
+
+1. Add a file in the **/locations** directory. 
+2. The file must include a variable defining a dictionary. That dictionary must follow the following structure: 
+
+```python
+location_variable = {
+  "USER_INPUT": {
+    "output": function_name,
+    "next_location_id": None
+  }
+}
+```
+
+Replace the `location_variable` with a unique name. 
+
+For each possible user input, add a dictionary. The dictionary must have a `output` and `next_location_id` value. 
+
+The `output` should be assigned a function and `return` a string to display to the user. 
+
+The `next_location_id` should be any ID available in the `locations` dictionary in the **main.py** file if the user in put should change the location to that place. Use `None` if the location should not be changed.
+
+Define a `"fallback"` as `USER_INPUT` for one of the dictionaries to catch all not-matched user inputs. 
+
+Once the room is defined: 
+
+1. Import the room's dictionary variable in the **main.py** file. 
+2. Give the location an ID and define it as _key_ in the `locations` variable of the **main.py** file. Reference the imported room to that key (see other rooms as example).
+3. Ensure your room is accessible from anywhere in the existing game by adding its ID string (defined above) as `next_location_id` to another room.