diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..631d158
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[workspace]
+
+members = [
+  "common",
+  "core",
+]
diff --git a/common/Cargo.toml b/common/Cargo.toml
new file mode 100644
index 0000000..b7723d9
--- /dev/null
+++ b/common/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "common"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/common/src/domain/mod.rs b/common/src/domain/mod.rs
new file mode 100644
index 0000000..fe4d7da
--- /dev/null
+++ b/common/src/domain/mod.rs
@@ -0,0 +1 @@
+//! Domain information.
diff --git a/common/src/lib.rs b/common/src/lib.rs
new file mode 100644
index 0000000..d7abca1
--- /dev/null
+++ b/common/src/lib.rs
@@ -0,0 +1 @@
+pub mod domain;
diff --git a/store/Cargo.toml b/store/Cargo.toml
new file mode 100644
index 0000000..640e569
--- /dev/null
+++ b/store/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "store"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/store/src/domain/mod.rs b/store/src/domain/mod.rs
new file mode 100644
index 0000000..fda665a
--- /dev/null
+++ b/store/src/domain/mod.rs
@@ -0,0 +1 @@
+//! Store own domain.
diff --git a/store/src/lib.rs b/store/src/lib.rs
new file mode 100644
index 0000000..6b92c53
--- /dev/null
+++ b/store/src/lib.rs
@@ -0,0 +1 @@
+mod domain;