Add .env file.

Author: VJalili

.env

@@ -0,0 +1,13 @@
+# Compose supports declaring default environment variables in an environment 
+# file named .env placed in the folder docker-compose command is executed 
+# from (current working directory).
+#
+# Compose expects each line in an env file to be in VAR=VAL format. Lines 
+# beginning with # (i.e. comments) are ignored, as are blank lines.
+#
+# Note: Values present in the environment at runtime will always override 
+# those defined inside the .env file. Similarly, values passed via command-line 
+# arguments take precedence as well.
+
+# SCOPUS API KEY
+# SCOPUS_API_KEY=<replace with your API key without brackets>