Add manual license entry in Golioth's apps

GitHub's license detection fails in two of Golioth's apps, but based on
the content, it's meant to be Apache 2.0.

index/golioth.json

@@ -14,13 +14,15 @@
             "title": "CAN / OBD-II Asset Tracker Reference Design",
             "description": "This Reference Design requires external hardware on top of an nRF9160-DK (see [https://projects.golioth.io/reference-designs/can-asset-tracker/guide-nrf9160-dk/](https://projects.golioth.io/reference-designs/can-asset-tracker/guide-nrf9160-dk/), but includes all code required to pass messages received on a CAN bus back to the Cloud, as well as regular GPS readings. Over-the-air updates are built in.",
             "kind": "template",
+            "license": "Apache 2.0",
             "tags": ["dfu","lte"]
         },
         {
             "name": "reference-design-air-quality",
             "title": "Air Quality Monitor Reference Design",
             "description": "This Reference Design requires external hardware on top of an nRF9160-DK (see [https://projects.golioth.io/reference-designs/air-quality-monitor/guide-nrf9160-dk](https://projects.golioth.io/reference-designs/air-quality-monitor/guide-nrf9160-dk/), but includes all code required to monitor readings from connected air quality sensors and pass back to the Cloud. Includes remote procedure call to clean sensor, and Over-the-air updates are built in.",
             "kind": "template",
+            "license": "Apache 2.0",
             "tags": ["dfu","lte"]
         }
     ]