Feat/unsloth example (#482)

* cleaned up examples

* updated failing hooks

* updated readme

* corrected linting checks

examples/unsloth/README.md

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+# Chain Sum LORA Training with unsloth
+
+This example demonstrates how to fine-tune an LLM with RL on a reasoning gym environment using the **unsloth** framework. Unsloth is a efficient open-source library for fine-tuning & RL. Unsloths default training path uses quantised low rank adaption (QLORA) which results in a signficantly lower memory footprint ($\approx 3x$) and means you can significantly increase batch sizes and context length without risking OOM errors.
+
+Requirements:
+
+python >= 3.10
+
+## Installation
+
+1. **Install reasoning-gym**:
+   ```bash
+   pip install reasoning-gym
+   ```
+2. **Install unsloth dependencies**:
+   ```bash
+   pip install -r requirements.txt
+   ```
+3. **Run training script**
+   To start training with unsloth with RG environments using default arguments run the following:
+
+   ```bash
+   python train_grpo_lora.py
+   ```
+
+   To customise/override any default arguments you can simply:
+   ```bash
+   python train_grpo_lora.py  --dataset-name chain_sum --max-seq-length 512 --model-id Qwen/Qwen2.5-7B-Instruct
+
+**Note** the free open-source version of  unsloth is currently built to train models in single GPU environments only.