Add Travis file (validate json files)

.travis.yml

@@ -0,0 +1,17 @@
+language: bash
+
+sudo: required
+
+dist: trusty
+
+install:
+    - git clone https://github.com/stedolan/jq.git
+    - pushd jq
+    - autoreconf -i
+    - ./configure --disable-maintainer-mode
+    - make
+    - sudo make install
+    - popd
+
+script:
+    - cat */*.json | jq .

README.md

@@ -1,5 +1,7 @@
 # misp-galaxy
 
+[![Build Status](https://travis-ci.org/MISP/misp-galaxy.svg?branch=master)](https://travis-ci.org/MISP/misp-galaxy)
+
 MISP galaxy is a simple method to express a large object called cluster that can be attached to MISP events or
 attributes. A cluster can be composed of one or more elements. Elements are expressed as key-values. There
 are default elements available in MISP galaxy but those can be overwritten, replaced or updated as you wish.