Update docs (#7)

Reviewed-on: phoenix/textsender-auth#7
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

README.md

@@ -1,2 +1,20 @@
 # textsender-auth
-A service that handles the authorization aspect of the textsender project.
+A service that handles the authorization aspect of the textsender project.
+
+
+## Getting started
+Assumes that the postgresql database has already been created with privileges to
+create and drop databases. Copy the `.env.sample` file to `.env`. Within the `.env`
+file, update the database keys. The `SECRET_KEY` is used for token generation.
+
+
+### Building api
+```
+go build -o textsender-auth cmd/api/main.go
+```
+
+
+### Resetting the database
+```
+./textsender-auth -reset-db
+```