Add mongodb to registry

registry/mongodb/README.md

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+## Overview
+
+`ndc-mongodb` provides a Hasura Data Connector to the MongoDB database,
+which can expose and run GraphQL queries via the Hasura v3 Project.
+
+- [MongoDB Connector information in the Hasura Connectors directory](https://hasura.io/connectors/mongodb)
+- [GitHub repository](https://github.com/hasura/ndc-mongodb)
+
+The connector implements the [NDC Specification](https://hasura.github.io/ndc-spec/overview.html),
+but does not currently support mutations, column relationship arguments in queries, functions or procedures.
+
+Visit the
+[Hasura v3 Documentation](https://hasura.io/docs/3.0/native-data-connectors/mongodb) 
+for more information.
+
+## Usage
+
+Follow the [Quick Start Guide](https://hasura.io/docs/3.0/quickstart/) 
+to use the MongoDB data connector from the [Hasura v3 Console](https://console.hasura.io).
+
+## Troubleshooting
+
+Please [submit a Github issue](https://github.com/hasura/graphql-engine/issues/new)
+if you encounter any problems!

registry/mongodb/metadata.json

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+{
+  "overview": {
+    "namespace": "hasura",
+    "description": "Connect to a MongoDB database and expose it to Hasura v3 Project",
+    "title": "MongoDB Connector",
+    "logo": "logo.png",
+    "tags": ["MongoDB"],
+    "latest_version": "v0.0.1"
+  },
+  "author": {
+    "support_email": "[email protected]",
+    "homepage": "https://hasura.io",
+    "name": "Hasura"
+  },
+  "is_verified": true,
+  "is_hosted_by_hasura": false,
+  "packages": [
+    {
+      "version": "0.0.1",
+      "uri": "https://github.com/hasura/ndc-mongodb/releases/download/v0.0.1/connector-definition.tgz",
+      "checksum": {
+        "type": "sha256",
+        "value": "2cd3584557be7e2870f3488a30cac6219924b3f7accd9f5f473285323843a0f4"
+      },
+      "source": {
+        "hash": "c32adbde478147518f65ff465c40a0703239288a"
+      }
+    }
+  ],
+  "source_code": {
+    "is_open_source": true,
+    "repository": "https://github.com/hasura/ndc-mongodb/",
+    "version": [
+      {
+        "tag": "v0.0.1",
+        "hash": "c32adbde478147518f65ff465c40a0703239288a",
+        "is_verified": true
+      }
+    ]
+  }
+}