repotest: add json linting

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I99dadfac3c2d324bb5ef6a5ab399ad35825b34d5
diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..abd7853
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["plugin:json/recommended-with-comments"]
+}