- Add main function with plugin.Serve to initialize Terraform provider plugin
- Add Provider function returning schema.Provider with api_url and api_key configuration
- Add api_url schema with TELECOM_API_URL environment variable fallback to http://localhost:8000
- Add api_key schema with TELECOM_API_KEY environment variable, marked as sensitive and optional
- Register resources: telecom_subscriber and
- Add APIClient struct with BaseURL, APIKey, and HTTPClient with 30s timeout
- Add providerConfigure to initialize client from schema with api_url and api_key
- Add doRequest helper with context support, JSON marshaling, Content-Type and Authorization headers
- Add get method accepting GET requests with 200 OK validation and JSON decoding
- Add post method accepting POST requests with 200/201 status validation and optional
nutcas3