feat: initial implementation with docs and system_config

CONTRIBUTING.md

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+# Contributing to Terraform Provider Immich
+
+We love your contributions! Here's a quick guide on how to help out.
+
+## Development Requirements
+
+- [Go](https://golang.org/doc/install) >= 1.21
+- [Terraform](https://www.terraform.io/downloads.html) >= 1.0
+
+## Building
+
+```shell
+go build .
+```
+
+## Running Tests
+
+To run the full suite of acceptance tests, you will need a running Immich instance.
+
+```shell
+# Set environment variables for the test instance
+export IMMICH_ENDPOINT=http://localhost:2283/api
+export IMMICH_API_KEY=your-admin-api-key
+
+# Run acceptance tests
+TF_ACC=1 go test ./... -v
+```
+
+## Documentation
+
+Documentation is generated using [tfplugindocs](https://github.com/hashicorp/terraform-plugin-docs).
+
+```shell
+go generate ./...
+```