docs: update README steps for clarity in cloning and building instructions

Author: Artlesbol

README.md

@@ -25,20 +25,23 @@ Build the library, install the Python codegen package, and run the full test
 suite:
 
 ```bash
-# 1. Clone with submodules
-git clone --recurse-submodules https://github.com/Artlesbol/FlagFFT-dev.git
+# 1. Clone
+git clone https://github.com/Artlesbol/FlagFFT-dev.git
 cd FlagFFT-dev
 
-# 2. Build the library, CLI, and test binaries
+# 2. Initialize submodule
+git submodule update --init --recursive
+
+# 3. Build the library, CLI, and test binaries
 cmake -B build -DCMAKE_BUILD_TYPE=Release \
       -DFLAGFFT_BUILD_CLI=ON \
       -DFLAGFFT_BUILD_TESTS=ON
 cmake --build build -j$(nproc)
 
-# 3. Install the Python codegen package (required for JIT kernel generation)
+# 4. Install the Python codegen package (required for JIT kernel generation)
 pip install .
 
-# 4. Run the full accuracy + performance test suite
+# 5. Run the full accuracy + performance test suite
 python tools/run_tests.py --combination full --gpus 0
 ```
 
@@ -53,7 +56,7 @@ A pre-built environment with all dependencies is available:
 ```bash
 docker build -t flagfft-dev -f docker/Dockerfile .
 docker run --gpus all -v $(pwd):/workspace/FlagFFT-dev -it flagfft-dev
-# Inside the container, run steps 2-4 from above.
+# Inside the container, run steps 3-5 from above.
 ```
 
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