first pass on create client text

Author: wjallen

docs/create_client.md

@@ -1 +1,35 @@
-# Create the API Client Key
+### Create the API Client Key
+
+The Agave CLI is used to configure the user environment to interact with the 
+SD2E platform. If you do not yet have the CLI installed and in your $PATH, first
+go [here](install_cli.md).
+
+Your user environment can be set up in one of two ways:
+1. Automatically using the set up script
+2. Manually using the CLI
+
+
+#### 1. Automatically using the set up script
+
+(forthcoming)
+
+#### 2. Manually using the CLI
+
+On the command line, perform the following:
+
+```
+# Initiate with the SD2E tenant
+%tenants-init -t sd2e
+
+# Create a client (enter TACC username and password)
+%clients-create -S -N my_client -D "My client used for interacting with SD2E"
+
+# Create an auth token (enter TACC password)
+%auth-tokens-create -S
+
+# Check the status of the token
+% auth-check
+
+# Refresh an expired token:
+% auth-tokens-refresh
+```