Update readme

Mention command to enable git hooks

Add some extra whitespace

Author: tweska

README.md

@@ -12,11 +12,13 @@ multio is a package developed by ECMWF that provides an application programming
 The fundamental design principle behind multio is that data is decoupled from metadata, and that the
 metadata is used for routing the data through the post-processing pipelines.
 
+
 Documentation
-------------
+-------------
 
 The documentation can be found at https://multio.readthedocs.io.
 
+
 Requirements
 ------------
 
@@ -37,6 +39,7 @@ Build dependencies:
 - ecbuild -- ECMWF library of CMake macros (available via apt or see https://github.com/ecmwf/ecbuild)
 - MPI -- an implementation of MPI may be required for the I/O-server functionality, see https://www.mpi-forum.org/
 
+
 Installation
 ------------
 
@@ -72,8 +75,18 @@ Now proceed with installation as follows.
    make install
    ```
 
+
+GIT hooks
+---------
+
+Please run the following command in the project root to use our git hooks:
+```bash
+git config core.hooksPath .githooks
+```
+
+
 Copyright and license
-------------
+---------------------
 
 (C) Copyright 2005- ECMWF.