Add building information in Readme

Author: cedricchevalier19

README.md

@@ -1,11 +1,55 @@
 # [coupe]
 
-A modular, multi-threaded partitioning library.
+A modular, multithreaded partitioning library.
 
 Coupe implements a variety of algorithms that can be used to partition meshes,
-graphs and numbers.  See [the API docs][coupe] for a list.  These algorithms can
+graphs and numbers. See [the API docs][coupe] for a list. These algorithms can
 be composed together to build relevant partitions of your data.
 
+## Getting Coupe
+
+### Released versions
+
+The simplest way to use `Coupe` is from Rust, referencing `coupe` crate.
+
+### Building from source
+
+`Coupe` is written in Rust, so you'll need to grab a Rust installation in order to compile it. In general, `Coupe`
+tracks the latest stable release of the Rust compiler.
+
+To build the whole `Coupe` platform:
+
+```shell
+git clone https://github.com/LIHPC-Computational-Geometry/coupe/
+cd coupe
+cargo build --workspace --release
+```
+
+By default, `Coupe` tools need `Scotch` and `Metis`. It can be disabled using
+
+```shell
+cargo build --workspace --release --no-default-features
+```
+
+Else, if you want `Scotch` or `Metis` support, you might need to pass some information about header location.
+On some systems, files like `scotch.h` are not in standard include directories. One can configure it
+using `BINDGEN_EXTRA_CLANG_ARGS` environment variable.
+It can be set from the shell or using `.cargo/config.toml` file like this (this example is for debian and ubuntu
+systems)
+
+```toml
+[env]
+BINDGEN_EXTRA_CLANG_ARGS = "-I/usr/include/scotch"
+```
+
+`Coupe` is relatively well-tested, including both unit tests and integration tests. To run the full test suite, use:
+
+```shell
+cargo test --all --workspace
+```
+
+from the repository root.
+
 ## Usage
 
 ### From the command-line
@@ -22,8 +66,8 @@ example usages of the library.
 
 Coupe offers a C interface which can be found in the `ffi/` directory.
 
-Bindings for other languages have not been made yet.  If you end up developing
-such bindings, please send us a note so they can be shown here!
+Bindings for other languages have not been made yet. If you end up developing
+such bindings, please send us a note, so they can be shown here!
 
 ## Contributing
 
@@ -36,20 +80,21 @@ reports on the [issue tracker][issues].
 
 Licensed under either of
 
- * Apache License, Version 2.0
-   ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- * MIT license
-   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+* Apache License, Version 2.0
+  ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+* MIT license
+  ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
 
 at your option.
 
 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.
 
-
-[67]: https://github.com/LIHPC-Computational-Geometry/coupe/pull/67
 [coupe]: https://docs.rs/coupe
+
 [discussions]: https://github.com/LIHPC-Computational-Geometry/coupe/discussions
+
 [issues]: https://github.com/LIHPC-Computational-Geometry/coupe/issues
+
 [pulls]: https://github.com/LIHPC-Computational-Geometry/coupe/pulls