adding device memory base

src/vulkan/Buffer.zig

@@ -0,0 +1,13 @@
+const std = @import("std");
+const vk = @import("vulkan");
+
+const VkError = @import("error_set.zig").VkError;
+const Device = @import("Device.zig");
+
+const Self = @This();
+pub const ObjectType: vk.ObjectType = .buffer;
+
+owner: *const Device,
+size: vk.DeviceSize,
+offset: vk.DeviceSize,
+usage: vk.BufferUsageFlags,