docs: Reformat README

README.md

@@ -8,15 +8,11 @@
 ![License](https://img.shields.io/crates/l/defenestrate.svg)
 [![Crates Status](https://img.shields.io/crates/v/defenestrate.svg)](https://crates.io/crates/defenestrate)
 
+## [Install](docs/install.md)
+
 ## [About](docs/about.md)
 
-## Install
-
-For now, `rust` is required for install:
-
-```bash
-cargo install defenestrate
-```
+## [Contribute](CONTRIBUTING.md)
 
 ## License
 
@@ -27,12 +23,5 @@ Licensed under either of
 
 at your option.
 
-### Contribution
-
-Unless you explicitly state otherwise, any contribution intentionally
-submitted for inclusion in the work by you, as defined in the Apache-2.0
-license, shall be dual licensed as above, without any additional terms or
-conditions.
-
 [Crates.io]: https://crates.io/crates/defenestrate
 [Documentation]: https://docs.rs/defenestrate

docs/install.md

@@ -0,0 +1,8 @@
+# Install
+
+For now, `rust` is required for install:
+
+```bash
+cargo install defenestrate
+```
+