Add Matrix/Riot package and updated README

package-riot/templates/riot-config.json.j2

@@ -0,0 +1,37 @@
+{
+    "default_hs_url": "https://im.{{ blsedomains_webdomain }}",
+    "default_is_url": "https://im.{{ blsedomains_webdomain }}",
+    "disable_custom_urls": false,
+    "disable_guests": false,
+    "disable_login_language_selector": false,
+    "disable_3pid_login": false,
+    "brand": "Riot",
+    "integrations_ui_url": "https://scalar.vector.im/",
+    "integrations_rest_url": "https://scalar.vector.im/api",
+    "integrations_jitsi_widget_url": "https://scalar.vector.im/api/widgets/jitsi.html",
+    "bug_report_endpoint_url": "https://riot.im/bugreports/submit",
+    "features": {
+        "feature_groups": "labs",
+        "feature_pinning": "labs"
+    },
+    "default_federate": true,
+    "default_theme": "light",
+    "roomDirectory": {
+        "servers": [
+            "{{ blsedomains_webdomain }}",
+            "im.{{ blsedomains_webdomain }}"
+        ]
+    },
+    "welcomeUserId": "@riot-bot:matrix.org",
+    "piwik": {
+        "url": "https://piwik.riot.im/",
+        "whitelistedHSUrls": ["https://{{ blsedomains_webdomain }}", "https://im.{{ blsedomains_webdomain }}", "https://matrix.org"],
+        "whitelistedISUrls": ["https://{{ blsedomains_webdomain }}", "https://im.{{ blsedomains_webdomain }}", "https://vector.im", "https://matrix.org"],
+        "siteId": 1
+    },
+    "enable_presence_by_hs_url": {
+        "https://{{ blsedomains_webdomain }}": true,
+        "https://im.{{ blsedomains_webdomain }}": true,
+        "https://matrix.org": true
+    }
+}