Add usage instructions

README.md

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+# Span Identification Adapter
+
+This adapter was trained for span identification in Ukrainian news text.
+
+## Usage
+
+```python
+from adapters import AutoAdapterModel
+
+# Load base model
+model = AutoAdapterModel.from_pretrained("xlm-roberta-base")
+
+# Load this adapter
+adapter_name = model.load_adapter("dariast/span-identification-adapter", source="hf")
+
+# Add classification head (if not already present)
+model.add_tagging_head(
+    adapter_name,
+    num_labels=2,
+    id2label={0: "NON-SPAN", 1: "SPAN"}
+)
+
+# Activate adapter
+model.set_active_adapters(adapter_name)
+```
+
+## Performance
+
+- Best F1 Score: 0.5849
+- From 5-fold cross-validation
+- Trained on Ukrainian news span identification task