Meta: Add gn rules for dependencies of LibWeb

There's a lot of them, and LibWeb is a massive set of files to build as
well, so let's add these first :^).

Meta/gn/secondary/Userland/Libraries/LibWebSocket/BUILD.gn

@@ -0,0 +1,16 @@
+shared_library("LibWebSocket") {
+  output_name = "websocket"
+  include_dirs = [ "//Userland/Libraries" ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibCrypto",
+    "//Userland/Libraries/LibTLS",
+  ]
+  sources = [
+    "ConnectionInfo.cpp",
+    "Impl/WebSocketImpl.cpp",
+    "Impl/WebSocketImplSerenity.cpp",
+    "WebSocket.cpp",
+  ]
+}