Add necessary Android.bp file

Change-Id: If06b4849babb1806205cb26208407aea7e24e98f
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..55bdc36
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,60 @@
+//
+// Copyright (C) 2020 Gao Xiang
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_defaults {
+    name: "erofs-utils_defaults",
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wno-ignored-qualifiers",
+        "-Wno-pointer-arith",
+        "-Wno-unused-parameter",
+        "-DPACKAGE_VERSION=\"1.1\"",
+        "-DHAVE_FALLOCATE",
+        "-DHAVE_LINUX_TYPES_H",
+        "-DHAVE_LIBSELINUX",
+        "-DHAVE_LIBUUID",
+        "-DLZ4_ENABLED",
+        "-DLZ4HC_ENABLED",
+        "-DWITH_ANDROID",
+    ],
+    local_include_dirs: [
+        "include",
+    ],
+    include_dirs: [
+        "external/e2fsprogs/lib/",
+    ],
+    shared_libs: [
+        "libcutils",
+        "libext2_uuid",
+        "libselinux",
+    ],
+    static_libs: [
+        "liblz4",
+    ],
+}
+
+cc_binary_host {
+    name: "mkfs.erofs",
+
+    defaults: ["erofs-utils_defaults"],
+
+    srcs: [
+        "lib/*.c",
+        "mkfs/*.c",
+    ],
+}
+