[libgda.wiki] Add link to Testing page

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 8882f8936ed656aa85c72f694af5ccb23e6d1859
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Fri Jan 11 17:04:21 2019 +0000

    Add link to Testing page

 home.md | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/home.md b/home.md
index cb69115..a8191cf 100644
--- a/home.md
+++ b/home.md
@@ -5,3 +5,6 @@ Is a library to access databases, using an uniform API. You can use C, C++, Java
 **Documentation**
 
 You can [browse generated documentation](https://gnome.pages.gitlab.gnome.org/libgda) from master.
+
+**Testing**
+In order to test GDA for development purposes, please visit our [Testing](Testing) guide.
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