docs: convert README from rst to markdown

Author: ktok07b6

README.md

@@ -0,0 +1,48 @@
+[![Test Suite](https://github.com/ktok07b6/polyphony/actions/workflows/test.yml/badge.svg?branch=devel)](https://github.com/ktok07b6/polyphony/actions/workflows/test.yml)
+[![PyPI](https://badge.fury.io/py/polyphony.svg)](https://badge.fury.io/py/polyphony)
+[![Python](https://img.shields.io/badge/python-%3E%3D3.12-blue)](https://github.com/ktok07b6/polyphony)
+[![License](https://img.shields.io/github/license/ktok07b6/polyphony)](https://github.com/ktok07b6/polyphony/blob/main/LICENSE)
+
+# polyphony
+
+Polyphony is a Python-based High-Level Synthesis (HLS) compiler that generates synthesizable Verilog HDL from a Python subset.
+
+## Requirements
+
+- Python >= 3.12
+- Icarus Verilog (for HDL simulation)
+
+## Installation
+
+```bash
+pip install polyphony
+```
+
+## Usage
+
+```
+polyphony [-h] [-o FILE] [-d DIR] [-c CONFIG] [-v] [-D] [-hd] [-q]
+          [-vd] [-vm] [-op PREFIX] [-t TARGETS [TARGETS ...]] [-V]
+          source
+```
+
+| Option | Description |
+|--------|-------------|
+| `-o FILE, --output FILE` | output filename (default is "polyphony_out") |
+| `-d DIR, --dir DIR` | output directory |
+| `-c CONFIG, --config CONFIG` | set configuration (JSON literal or file) |
+| `-v, --verbose` | verbose output |
+| `-D, --debug` | enable debug mode |
+| `-hd, --hdl_debug` | enable HDL debug mode |
+| `-q, --quiet` | suppress warning/error messages |
+| `-vd, --verilog_dump` | output VCD file in testbench |
+| `-vm, --verilog_monitor` | enable $monitor in testbench |
+| `-V, --version` | print the Polyphony version number |
+
+## Examples
+
+See [tests](https://github.com/ktok07b6/polyphony/tree/main/tests)
+
+## License
+
+MIT License. See [LICENSE](LICENSE) for details.

README.rst

@@ -2,7 +2,7 @@
 name = "polyphony"
 version = "0.4.0"
 description = "Python based High Level Synthesis compiler"
-readme = "README.rst"
+readme = "README.md"
 license = { text = "MIT" }
 authors = [{ name = "Hiroaki Kataoka", email = "ktok07b6@gmail.com" }]
 keywords = ["HLS", "High Level Synthesis", "FPGA", "HDL", "Verilog"]