Add setup for YAML/JSON files linting

Tox based setup for running linters on YAML and
JSON files. It can be run manually to verify local
changes in _commited_ files.

Relevant CI job (created at Change-Id:
I4f130f6c68222d53dcf022f3fd4a2b41765eaf45) triggered
by change to any of yaml/json files leverages this
setup to run verify tasks.

Change-Id: I07845e3771c0246847184217a96dc90764595f17
Issue-ID: INT-1427
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..ab5bdc3
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,16 @@
+---
+
+extends: default
+
+rules:
+  line-length: disable
+  truthy: disable
+  braces:
+    max-spaces-inside: 1
+  brackets:
+    max-spaces-inside: 1
+  comments-indentation: disable
+  comments: disable
+  document-start: disable
+  indentation:
+    indent-sequences: whatever