basic doc on authentication

README.md

@@ -10,7 +10,7 @@
 
 This is a terraform provider plugin for managing [Snowflake](http://snowflakedb.com) accounts.
 
-## Setup (to use)
+## Install
 
 The easiest way is to run this command:
 
@@ -24,6 +24,26 @@ You can also just download a binary from our [releases](https://github.com/chanz
 
 TODO fogg config
 
+## Authentication
+
+We currently only support username + password auth and suggest that you only do so via environment variables. So a config something like–
+
+```hcl
+provider "snowflake" {
+  account = "..."
+  role    = "..."
+  region  = "..."
+}
+```
+
+and
+
+```shell
+export SNOWFLAKE_USER='...'
+export SNOWFLAKE_PASSWORD='...'
+terraform ...
+```
+
 ## Resources
 
 We support managing a subset of snowflakedb resources, with a focus on access control and management.