draft readme with building and testing instructions

README.md

@@ -3,3 +3,20 @@
 Utility to evaluate deterministic and probabilistic streamflow predictions
 
 Documentation: https://hycar-hydro.gitlab.irstea.page/evalhyd/evalhyd-docs/cpp
+
+## How to build
+
+Configure project in debug mode finding libraries in conda environment:
+```shell
+cmake -B build/ -D CMAKE_BUILD_TYPE=Debug -D CMAKE_PREFIX_PATH="$CONDA_PREFIX"
+```
+
+Compile with:
+```shell
+cmake --build build/ --parallel 2
+```
+
+Run tests with:
+```shell
+./build/tests/evalhyd_tests  
+```