Add linking duplicates script

linking/README.md

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+# Linking Duplicate Patient Resources
+
+This script takes in the IDs of duplicate patient resources and links them using the `patient.link` attribute
+
+## Setup
+1. Navigate to the `linking` directory
+   ```
+   cd .../linking
+   ```
+2. Create and activate a virtual environment
+   ```
+   virtualenv venv
+   source venv/bin/activate
+   ```
+3. Install dependencies
+   ```
+   pip install -r requirements.txt
+   ```
+4. Update the `config.py` file with the correct credentials to access your server
+
+## Usage
+- To run the script you need to pass in the IDs of two patient resource. For example
+   ```
+  python3 main.py --patient_ids "12345678|91011121"
+   ```

linking/config.py

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+client_id = 'client_id'
+client_secret = 'client_secret'
+username = 'username'
+password = 'password'
+access_token_url = 'https://keycloak.smartregister.org/auth/realms/your-realm-here/protocol/openid-connect/token'
+fhir_base_url = 'https://example.smartregister.org/fhir'
+keycloak_url = 'https://keycloak.smartregister.org/auth/admin/realms/your-realm-here'