Update README.md

Author: Ethan O'Sullivan

README.md

@@ -1,2 +1,13 @@
-# json-to-csv
-is Python code helps convert several individual JSON files, locally, into one CSV.
+# Convert JSON to CSV in Python
+This Python code helps convert several individual JSON files, locally, into one CSV. Additionally, this code allows the user to cherry-pick the field names from the JSON dataset.
+
+## How to Use the Code
+To run the code and get the expected output, use the following steps:
+
+1. Compile all JSON files into one folder, locally.
+    - Note: there shouldn't be any other file types or sub-folders
+1. Open the Python script in your IDE.
+1. Set up the following variables based on your preferences:
+    - `file_path`: Enter the path to the JSON and the filename without appending `.json`
+    - `key_list`: Extract data from the defined key names
+    - `key_ignore`: Key names to ignore separated by a vertical bar (`|`)