📝 added the initial README.md to describe the prupose of the repo

Author: m-misiura

README.md

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+# Detectors for the FMS Guardrails Orchestrator
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+[FMS Guardrails Orchestrator](https://github.com/foundation-model-stack/fms-guardrails-orchestrator) is an open source project led by IBM which provides a server for invocation of detectors on text generation input and output, and standalone detections. 
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+This repository is intended to provide a collection of detectors that are supported by [the TrustyAI team](https://github.com/trustyai-explainability).
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+## Detectors
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+At the moment, the following detectors are supported:
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+- `huggingface` -- a generic detector class that is intended to be compatible with any [AutoModelForSequenceClassification](https://huggingface.co/docs/transformers/en/model_doc/auto#transformers.AutoModelForSequenceClassification) or a specific kind of [AutoModelForCausalLM](https://huggingface.co/docs/transformers/en/model_doc/auto#transformers.AutoModelForCausalLM), namely [GraniteForCausalLM](https://github.com/ibm-granite/granite-guardian); this detector exposes `/api/v1/text/contents` and thus, could be configured to be a detector of type: `text_contents` within the FMS Guardrails Orchestrator framework. This detector is also intended to be deployed as a [KServe](https://github.com/kserve/kserve) inference service. 
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