Update README.md with contributing instructions

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/README.md b/README.md
index 3575913..2a80f89 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,22 @@ A self assessment tool for learning languages.
 
 **UNDER CONSTRUCTION**
 
-Set the `MIHI_DATABASE` environment variable to `test.sqlite3`.
+## Contributing
+
+This application is built like any other Rust project:
+
+```
+$ cargo build
+```
+
+In order to test things you need to provide a database for it. One is provided
+in the form of `testdata/test.sqlite3`. So take that and set the `MIHI_DATABASE`
+environment variable to its full path. And after that you will be able to run:
+
+```
+$ cargo test
+$ cargo clippy --all-targets --all-features
+```
 
 ## License