chore: add note about generating certs using go run

docs/Create_Certs.md

@@ -32,9 +32,11 @@ Create_Certs is written in Go which allows cross-platform compiling. If the bina
 
 With Go installed you can:
 
-* Execute the go code - `go run create_certs/src/create_certs.go` 
+* Execute the go code - `go run create_certs/src/create_certs.go`
 * Build a new binary for your platform - `go build create_certs/src/create_certs.go`
 
+Note: since the program looks for the Bumper_SAN.txt in a location relative to the executable and the executable with `go run` is in a `tmp` directory you'll most likely need to specify it with `go run ../create_certs/src/create_certs.go --inSAN ../create_certs/Bumper_SAN.txt` if you were running it from the `certs` directory.
+
 ### Usage
 
 Create_Certs will automatically create the required certificates in the directory it is executed from.  For best results change to the {bumper_home}/certs directory prior to executing, otherwise you'll need to move the certs after.
@@ -179,4 +181,4 @@ DNS.9 = *.area.ww.ecouser.net
 
 ## Using a Custom CA/Self
 
-This should work siimilar to the OpenSSL method.  Ensure the server certificate has the proper [SANs](#subject-alternative-name) in place.
+This should work siimilar to the OpenSSL method.  Ensure the server certificate has the proper [SANs](#subject-alternative-name) in place.