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+# Terraform module for mongodb-operator
+
+This is a Terraform module facilitating the deployment of the MongoDB charm with [Terraform juju provider](https://github.com/juju/terraform-provider-juju/). For more information, refer to the provider [documentation](https://registry.terraform.io/providers/juju/juju/latest/docs). 
+
+## Requirements
+This module requires a `juju` model to be available. Refer to the [usage section](#usage) below for more details.
+
+## API
+
+### Inputs
+The module offers the following configurable inputs:
+
+| Name | Type | Description | Required |
+| - | - | - | - |
+| `app_name`| string | Application name | False |
+| `channel`| string | Channel that the charm is deployed from | False |
+| `base`| string | The series to be used for this charm | False |
+| `config`| map(string) | Map of the charm configuration options | False |
+| `model_name`| string | Name of the model that the charm is deployed on | True |
+| `resources`| map(string) | Map of the charm resources | False |
+| `revision`| number | Revision number of the charm name | False |
+| `units`| number | Number of units to be deployed | False |
+| `constraints`| string | Machine constraints for the charm | False |
+| `storage`| map(string) | Storage description, must follow the juju provider schema | False |
+
+
+### Outputs
+Upon applied, the module exports the following outputs:
+
+| Name | Description |
+| - | - |
+| `app_name`|  Application name |
+| `provides`| Map of `provides` endpoints |
+| `requires`| Map of `requires` endpoints |
+
+## Usage
+
+This module is intended to be used as part of a higher-level module. When defining one, users should ensure that Terraform is aware of the `juju_model` dependency of the charm module. There are two options to do so when creating a high-level module:
+
+### Define a `juju_model` resource
+Define a `juju_model` resource and pass to the `model_name` input a reference to the `juju_model` resource's name. For example:
+
+```
+resource "juju_model" "mongodb" {
+  name = mongodb
+}
+
+module "mongodb-operator" {
+  source = "<path-to-this-directory>"
+  model_name = juju_model.mongodb.name
+}
+```
+
+### Define a `data` source
+Define a `data` source and pass to the `model_name` input a reference to the `data.juju_model` resource's name. This will enable Terraform to look for a `juju_model` resource with a name attribute equal to the one provided, and apply only if this is present. Otherwise, it will fail before applying anything.
+
+```
+data "juju_model" "mongodb" {
+  name = var.model_name
+}
+
+module "mongodb" {
+  source = "<path-to-this-directory>"
+  model_name = data.juju_model.mongodb.name
+}
+```
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