doc: add README.md

README.md

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+# nearby-business-search
+
+Simple Go script to query Google Maps API `Nearby Search API` to gather data for target company research.
+
+Exports this data to an `.xlsx` spreadsheet.
+
+## Setup
+
+```bash
+cp .env.example .env
+```
+
+There are still some fields that I plan to move to the `.env` for configuring, but the majority of them are
+there now.
+
+A Google project API key will be needed.
+
+Be cautious of setting very large `MAX_RESULTS` as Google will eventually charge for this. Keep the number low 
+if you are testing.
+
+## Run
+
+```bash
+go run .
+```
+
+Or build it first.
+
+After you run the program, you will see logs stepping through stages of the progress. A simplified table will 
+be printed out to the terminal and the detailed `.xlsx` will be created based on what ever file name you gave 
+in the `.env`