diff --git a/Cargo.toml b/Cargo.toml
index 38d1955..471c0f6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,4 +3,4 @@ name = "library-rust"
 version = "0.1.0"
 edition = "2021"
 
-[dependencies]
+[dependencies]
\ No newline at end of file
diff --git a/readme.md b/readme.md
index 825ed57..d3d6db4 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,133 @@
 Rust Library
 ================
+> 專案共用核心
+
+### 建立專案的指令
+```bash
+cargo new my_project_name
+```
+
+### 推薦項目的目錄結構
+```
+my_project/
+├── Cargo.toml
+├── src/
+│   ├── main.rs
+│   ├── lib.rs
+│   ├── common/
+│   │   ├── mod.rs
+│   │   ├── config.rs
+│   │   ├── errors.rs
+│   │   ├── utils.rs
+│   │   ├── logger.rs
+│   │   └── types.rs
+│   └── some_other_module/
+│       ├── mod.rs
+│       └── other.rs
+└── tests/
+├── common_tests.rs
+└── other_tests.rs
+```
+
+### Current modules
+
+| module                       | latest version |
+|------------------------------|----------------|
+| [config](conf)               | v1.0.0         |
+
+## 如何新增Module
+
+> 假設新增一個 `module`
+>`utils/first_utils/first`
+
+### 初始化
+
+再一路的路徑底下的 mod.rs 新增資料匣或檔案名稱
+1. src/ 下 lib.rs
+```rust
+pub mod utils;
+```
+2. utils/ 下 mod.rs
+```rust
+pub mod first_utils;
+```
+
+3. first_utils/ 下 mod.rs
+```rust
+pub mod first;
+```
+這樣 first 裡面的 pub 函數就會被公開了
 
 
+```bash
+mkdir -p config
+cd ./config
+go mod init gitea.30cm.net/Ark/library-go/config
+go work use ./config
+```
+
+p.s 建議測試覆蓋率盡量達到80%
+
+```bash
+before-commit-check
+```
+
+2. commit
+
+```bash
+git add ./config
+git commit -m "feat: add config module"
+git tag "config/v1.0.0"
+git push origin config/v1.0.0
+```
+
+3. Merge request and Code
+   Review
+
+------------------
+
+## 如何使用私有Module
+
+強制git使用ssh方式而不是https:
+
+```bash
+git config --global --add url."git@git.30cm.net:".insteadOf "https://gitea.30cm.net/"
+```
+
+設定go env
+
+```bash
+export GOPRIVATE="gitea.30cm.net"
+```
+
+產生ssh-key
+請參考 [github ssh](https://docs.github.com/en/authentication/connecting-to-github-with-ssh) , [gitlab ssh](https://docs.gitlab.com/ee/user/ssh.html)
+
+add ssh key to the ssh-agent
+請參考 [Adding your SSH key to the ssh-agent](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent#adding-your-ssh-key-to-the-ssh-agent)
+
+```bash
+$ eval "$(ssh-agent -s)"
+> Agent pid 59566
+```
+
+```bash
+$ touch ~/.ssh/config
+```
+
+```
+Host yt.com
+  Hostname gitea.30cm.net
+  User igs170911
+  IdentityFile ~/.ssh/id_rsa
+```
+
+```bash
+$ ssh-add --apple-use-keychain ~/.ssh/id_ed25519
+```
+
+在自己repo底下執行:
+
+```bash
+go get gitea.30cm.net/Ark/library-go/config@v1.0.0
+```
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..fab870e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+pub mod utils;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a9..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}
diff --git a/src/utils/first_utils/first.rs b/src/utils/first_utils/first.rs
new file mode 100644
index 0000000..1079c5c
--- /dev/null
+++ b/src/utils/first_utils/first.rs
@@ -0,0 +1,4 @@
+// Just for testing to using library
+pub fn public_function() -> String {
+    "called public func `public_function()`".to_string()
+}
\ No newline at end of file
diff --git a/src/utils/first_utils/mod.rs b/src/utils/first_utils/mod.rs
new file mode 100644
index 0000000..844c965
--- /dev/null
+++ b/src/utils/first_utils/mod.rs
@@ -0,0 +1 @@
+pub mod first;
\ No newline at end of file
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
new file mode 100644
index 0000000..a4e977f
--- /dev/null
+++ b/src/utils/mod.rs
@@ -0,0 +1 @@
+pub mod first_utils;
\ No newline at end of file
diff --git a/tests/first_test.rs b/tests/first_test.rs
new file mode 100644
index 0000000..9151501
--- /dev/null
+++ b/tests/first_test.rs
@@ -0,0 +1,10 @@
+#[cfg(test)]
+mod tests {
+    use library_rust::utils;
+
+    #[test]
+    fn test_first() {
+       let result: String = utils::first_utils::first::public_function();
+        assert!(result.contains("called public func `public_function()`"));
+    }
+}
\ No newline at end of file