Merge pull request #200 from IFCA/fix-contributing

Fix contributing

Author: Jaime Céspedes Sisniega

CONTRIBUTING.md

@@ -1,6 +1,8 @@
 # How to contribute
 
-## Adding feature or solving a bug.
+Frouros is an open-source project. Anyone with an interest in the project can join the community and contribute to it in different ways. The following sections describe how you can contribute.
+
+## Adding a feature or solving a bug
 
 Recommended steps for first time contributors:
 
@@ -24,7 +26,7 @@ Recommended steps for first time contributors:
    ```
 5. Create pull request to the original repository.
 
-## Reporting bugs.
+## Reporting a bug
 
 1. Check that there is not an [issue](https://github.com/IFCA/frouros/issues) that currently highlights the bug or a [pull request](https://github.com/IFCA/frouros/pulls) that solves it.
 2. Create an [issue](https://github.com/IFCA/frouros/issues/new) in GitHub.