added readme text

Author: SandyYuan

eval_protocol/rewards/ifeval/README.md

@@ -31,3 +31,19 @@ python -m spacy download en_core_web_sm
 - Automatically strips `<think>...</think>` tags before evaluation
 - Ground truth can be a dict, list, or JSON string
 - 112 total constraints (54 IFEval/IFTrain + 58 IFBench OOD)
+
+## File Sources
+
+**Copied from `open-instruct/open_instruct/IFEvalG/`:**
+- `ifeval_instructions.py` (from `instructions.py`)
+- `ifeval_registry.py` (from `instructions_registry.py`)
+- `ifeval_util.py` (from `instructions_util.py`)
+
+**Copied from `IFBench/`:**
+- `ifbench_instructions.py` (from `instructions.py`)
+- `ifbench_registry.py` (from `instructions_registry.py`)
+- `ifbench_util.py` (from `instructions_util.py`)
+
+**New code:**
+- `reward.py` - main reward function
+- `__init__.py` - package exports