feat: add sincere

sincere/Cargo.toml

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+[package]
+name = "sincere"
+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]
+sincere = "0.6.6"
+

sincere/README.md

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+
+Crate.io:
+https://crates.io/crates/sincere
+
+

sincere/src/main.rs

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+use sincere::App;
+
+fn main() {
+    let mut app = App::new();
+
+    app.get("/", |context| {
+        context.response.from_text("Hello world!").unwrap();
+    });
+
+    app.run("127.0.0.1:8000", 20).unwrap();
+}