Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibCore/CSocketAddress.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <AK/IPv4Address.h>
+
+class CSocketAddress {
+public:
+    enum class Type {
+        Invalid,
+        IPv4,
+        Local
+    };
+
+    CSocketAddress() {}
+    CSocketAddress(const IPv4Address& address)
+        : m_type(Type::IPv4)
+        , m_ipv4_address(address)
+    {
+    }
+
+    Type type() const { return m_type; }
+    bool is_valid() const { return m_type != Type::Invalid; }
+    IPv4Address ipv4_address() const { return m_ipv4_address; }
+
+    String to_string() const
+    {
+        switch (m_type) {
+        case Type::IPv4:
+            return m_ipv4_address.to_string();
+        default:
+            return "[CSocketAddress]";
+        }
+    }
+
+private:
+    Type m_type { Type::Invalid };
+    IPv4Address m_ipv4_address;
+};