Comment out not implemented featuer

Signed-off-by: KeisukeYamashita <19yamashita15@gmail.com>

Author: KeisukeYamashita

README.md

@@ -9,13 +9,13 @@
 ### Features in detail
 
 Here, I will explain what the commands actually do.
-
+<!-- 
 #### `spa service-account get`: Get Service account
 
 It will do the following things:
 
 1. Get service account (and retrieve token)
-2. Create dedicated Kubernetes config
+2. Create dedicated Kubernetes config -->
 
 #### `spa service-account create`: Create Service Account