Add foswiki detection

This can be tested [here](https://www.rockbox.org/wiki/WebHome)

src/apps.json

@@ -2573,6 +2573,27 @@
 			"script": "cartjs\\.php\\?(?:.*&)?s=[^&]*myfortune3cart\\.com",
 			"website": "fortune3.com"
 		},
+		"Foswiki": {
+			"cats": [
+				8
+			],
+			"headers": {
+				"X-Foswikiuri": "",
+				"X-Foswikiaction": "",
+				"Set-Cookie": "^(?:FOSWIKISTRIKEONE|SFOSWIKISID)"
+			},
+			"meta": {
+				"foswiki.WIKINAME": "",
+				"foswiki.SERVERTIME": ""
+			},
+			"html": [
+				"<div class=\"foswiki(?:Copyright|Page|Main)\">"
+			],
+			"env": "^foswiki$",
+			"implies": "Perl",
+			"icon": "foswiki.png",
+			"website": "foswiki.org"
+		},
 		"FreeBSD": {
 			"cats": [
 				28