diff --git a/.gitignore b/.gitignore
index 65f1105..a919aef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,10 +3,6 @@
 # will have compiled files and executables
 /target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..0c8b7ee
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4fc6c01
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "hardownload"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "0.2.6", features = ["full"] }
+clap = "2.33.1"
+reqwest = "0.10.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
diff --git a/src/cmd.rs b/src/cmd.rs
new file mode 100644
index 0000000..7b40197
--- /dev/null
+++ b/src/cmd.rs
@@ -0,0 +1,12 @@
+use clap::{ ArgMatches, App, };
+
+pub type CommandError = Result<(), Box<dyn std::error::Error>>;
+
+pub trait Command {
+
+    fn subcommand<'a>(&self) -> App<'a, 'a>;
+
+    fn name(&self) -> &str;
+
+    fn run(&self, arg_matches: &ArgMatches, _: &ArgMatches) -> CommandError;
+}
diff --git a/src/cmd_default.rs b/src/cmd_default.rs
new file mode 100644
index 0000000..abf98a7
--- /dev/null
+++ b/src/cmd_default.rs
@@ -0,0 +1,24 @@
+use clap::{ App, Arg, ArgMatches, };
+use crate::cmd::CommandError;
+
+pub struct CommandDefault;
+
+impl CommandDefault {
+
+    pub fn process_command<'a>(app: App<'a, 'a>) -> App<'a, 'a> {
+        app.arg(Arg::with_name("verbose")
+                    .long("verbose")
+                    .short("v")
+                    .multiple(true)
+                    .help("Show verbose info")
+        )
+    }
+
+    pub fn run(arg_matches: &ArgMatches) -> CommandError {
+        let verbose_count = arg_matches.occurrences_of("verbose");
+        println!("[INFO] Verbose count: {}", verbose_count);
+        println!("[INFO] This is default command cli ...");
+        // TODO ...
+        Ok(())
+    }
+}
\ No newline at end of file
diff --git a/src/cmd_sample.rs b/src/cmd_sample.rs
new file mode 100644
index 0000000..b1bd812
--- /dev/null
+++ b/src/cmd_sample.rs
@@ -0,0 +1,20 @@
+use clap::{ ArgMatches, SubCommand, App, };
+use crate::cmd::{ Command, CommandError, };
+
+pub struct CommandSample;
+
+impl Command for CommandSample {
+
+    fn subcommand<'a>(&self) -> App<'a, 'a> {
+        SubCommand::with_name(self.name()).about("Sample subcommand")
+    }
+
+    fn name(&self) -> &str {
+        "sample"
+    }
+
+    fn run(&self, _arg_matches: &ArgMatches, _sub_arg_matches: &ArgMatches) -> CommandError {
+        println!("This is test command!");
+        Ok(())
+    }
+}
diff --git a/src/har.rs b/src/har.rs
new file mode 100644
index 0000000..c9e0531
--- /dev/null
+++ b/src/har.rs
@@ -0,0 +1,49 @@
+use serde::{Serialize, Deserialize};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HarCreator {
+    name: String,
+    version: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HarPageTimings {
+    #[serde(rename = "onContentLoad")]
+    on_content_load: f64,
+    #[serde(rename = "onLoad")]
+    on_load: f64,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HarPage {
+    #[serde(rename = "startedDateTime")]
+    started_date_time: String,
+    id: String,
+    title: String,
+    #[serde(rename = "pageTimings")]
+    page_timings: HarPageTimings,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HarEntry {
+    // startedDateTime
+    time: f64,
+    // request
+    // response
+    // cache
+    // timings
+    // serverIPAddress
+    // _initiator
+    // _priority
+    // _resourceType
+    // connection
+    pageref: String, // @see Harpage::id
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HarLog {
+    version: String,
+    creator: HarCreator,
+    pages: Vec<HarPage>,
+    entries: Vec<HarEntry>,
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..234931c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,32 @@
+use clap::App;
+
+mod cmd;
+mod cmd_sample;
+mod cmd_default;
+mod har;
+
+use cmd::{ Command, CommandError, };
+use cmd_sample::CommandSample;
+use cmd_default::CommandDefault;
+
+fn main() -> CommandError {
+    let commands = vec![
+        CommandSample{},
+    ];
+    let mut app = App::new(env!("CARGO_PKG_NAME"))
+                    .version(env!("CARGO_PKG_VERSION"))
+                    .about(env!("CARGO_PKG_DESCRIPTION"));
+    app = CommandDefault::process_command(app);
+    for command in &commands {
+        app = app.subcommand(command.subcommand());
+    }
+
+    let matches = app.get_matches();
+    for command in &commands {
+        if let Some(sub_cmd_matches) = matches.subcommand_matches(command.name()) {
+            return command.run(&matches, sub_cmd_matches);
+        }
+    }
+
+    CommandDefault::run(&matches)
+}