Create README.md

Author: groenroos

README.md

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+# MongoDB driver for Sapling
+
+This package allows using the [MongoDB](https://www.mongodb.com/) database engine with [Sapling](https://github.com/saplingjs/sapling/).
+
+
+## Installation
+
+### Via the CLI (recommended)
+
+This package can be installed via the [Sapling CLI](https://saplingjs.com/docs/#/cli) via the project creation questionnaire;
+
+    sapling create
+
+Or added to an existing project by re-running the questionnaire;
+
+    sapling edit
+
+
+### Manually
+
+Alternatively, if you prefer to install it manually, you can install it via npm;
+
+    npm install --save @sapling/db-driver-mongodb
+
+Then, modify your `config.json` to select the MongoDB driver;
+
+    {
+        "db": {
+            "driver": "MongoDB"
+        }
+    }
+
+
+## Usage
+
+Once installed, Sapling will use MongoDB running on `localhost` on port `27017` to persist all data.
+
+You can provide alternative host and port via config if you prefer;
+
+    {
+        "db": {
+            "driver": "MongoDB",
+            "host": "example.com",
+            "port": 27018
+        }
+    }
+
+
+## Questions & Issues
+
+Bug reports, feature requests and support queries can be filed as [issues on GitHub](https://github.com/saplingjs/db-driver-mongodb/issues).  Please use the templates provided and fill in all the requested details.
+
+
+## Changelog
+
+Detailed changes for each release are documented in the [release notes](https://github.com/saplingjs/db-driver-mongodb/releases).
+
+
+## License
+
+[Mozilla Public License 2.0](https://opensource.org/licenses/MPL-2.0)