diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 0000000..e013ea7
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,4 @@
+FROM mcr.microsoft.com/devcontainers/rust:1-1-bookworm
+
+# Install 'just' as root during the build process
+RUN curl --proto '=https' --tlsv1.2 -sSf https://just.systems/install.sh | bash -s -- --to /usr/local/bin
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..b8bbbb4
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,17 @@
+{
+    "name": "Gingko Development",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "rust-lang.rust-analyzer",
+                "tamasfe.even-better-toml",
+                "vadimcn.vscode-lldb",
+                "mutuhun.just"
+            ]
+        }
+    },
+    "remoteUser": "vscode"
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/cli/Cargo.lock b/cli/Cargo.lock
new file mode 100644
index 0000000..c3957db
--- /dev/null
+++ b/cli/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "cli"
+version = "0.1.0"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
new file mode 100644
index 0000000..16d2db2
--- /dev/null
+++ b/cli/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "cli"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/cli/src/main.rs b/cli/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/cli/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/core/Cargo.lock b/core/Cargo.lock
new file mode 100644
index 0000000..3f34dcb
--- /dev/null
+++ b/core/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "core"
+version = "0.1.0"
diff --git a/core/Cargo.toml b/core/Cargo.toml
new file mode 100644
index 0000000..143436c
--- /dev/null
+++ b/core/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "core"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/core/src/lib.rs b/core/src/lib.rs
new file mode 100644
index 0000000..2cc1a43
--- /dev/null
+++ b/core/src/lib.rs
@@ -0,0 +1,14 @@
+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}
\ No newline at end of file
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..25f255b
--- /dev/null
+++ b/justfile
@@ -0,0 +1,13 @@
+default:
+    @just --list --justfile {{justfile()}}
+
+build: build-core build-cli
+
+build-core:
+    cargo build --manifest-path "core/Cargo.toml"  --target-dir "target"
+
+build-cli: build-core
+    cargo build --manifest-path "cli/Cargo.toml" --target-dir "target"
+
+run:
+    cargo run --manifest-path "cli/Cargo.toml" --target-dir "target"