[gnome-boxes] readme: Add contributing instructions

[Felipe Borges <felipeborges src gnome org>]

commit 3451c63968ee2578b73d4a78041f22acc7e25603
Author: twisted-sres <sresthasrivastava ss gmail com>
Date:   Sun Mar 17 03:02:48 2019 +0530

    readme: Add contributing instructions

 README.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/README.md b/README.md
index 73d35cc4..e8579364 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,20 @@ include
 The determination of what is useful is your task. If you forget about
 something important, someone will probably ask.
 
+# Contributing
+
+## Finding Bugs
+
+Bugs labelled as "Newcomers" for the project can be found here:
+
+[Newcomers Bugs](https://gitlab.gnome.org/GNOME/gnome-boxes/issues?label_name%5B%5D=4.+Newcomers)
+
+## Building the Project
+
+Instructions for building the project can be found here:
+
+[Build the Project](https://wiki.gnome.org/Newcomers/BuildProject)
+
 # Appendix
 
 ## Backtracing