added documentation for SDS-SVI communications

Author: david-pettifor-nd

gateway/.envs/example/django.env

@@ -17,3 +17,10 @@ CLIENT_SECRET=
 # Redis
 # ------------------------------------------------------------------------------
 REDIS_URL=redis://redis:6379/0
+
+# SpectrumX Visualizations Interface Authentication Token
+# (this is needed by the SVI to communicate with the SDS to pull user's SDK API tokens;
+# the below two environment variables should also be set in the SVI's environment variables)
+SVI_SERVER_EMAIL=svi-server@spectrumx.crc.nd.edu
+# limit to 40 characters
+SVI_SERVER_API_KEY=

gateway/.envs/example/django.env-prod-example

@@ -47,3 +47,10 @@ REDIS_URL=redis://redis:6379/0
 # Flower
 CELERY_FLOWER_USER=
 CELERY_FLOWER_PASSWORD=
+
+# SpectrumX Visualizations Interface Authentication Token
+# (this is needed by the SVI to communicate with the SDS to pull user's SDK API tokens;
+# the below two environment variables should also be set in the SVI's environment variables)
+SVI_SERVER_EMAIL=svi-server@spectrumx.crc.nd.edu
+# limit to 40 characters
+SVI_SERVER_API_KEY=