Added RSI Launcher

with mixed content=true
Not sure if this is correct but it exclusively uses https

cache_domains.json

@@ -78,6 +78,12 @@
 			"description": "CDN for riot games",
 			"domain_files": ["riot.txt"]
 		},
+		{
+			"name": "rsi",
+			"description": "CDN for RSI launcher e.g. Star Citizen",
+			"mixed_content": true,
+			"domain_files": ["rsi.txt"]
+		},
 		{
 			"name": "rockstar",
 			"description": "CDN for rockstar games",