📝 Update README(Mooncake&Github)

docs/README-en.md

@@ -0,0 +1,58 @@
+# BitLogger
+
+BitLogger is a structured logging library written in MoonBit.
+
+## Overview
+
+BitLogger currently provides:
+
+- log levels: `Trace`, `Debug`, `Info`, `Warn`, `Error`
+- structured key-value fields
+- plain console output
+- JSON console output
+- child target composition via `child(...)`
+- context fields via `with_context_fields(...)`
+- optional timestamps via `with_timestamp()`
+- sink fanout via `fanout_sink(...)`
+- custom integration via `callback_sink(...)`
+- default global logger helpers
+
+## Quick Start
+
+```moonbit
+let logger = Logger::new(console_sink(), min_level=Level::Info, target="demo")
+  .with_timestamp()
+  .with_context_fields([field("service", "bitlogger")])
+
+logger.info("starting", fields=[field("port", "8080")])
+```
+
+Child target composition:
+
+```moonbit
+let worker = Logger::new(console_sink(), target="app").child("worker")
+worker.info("job ready")
+```
+
+Custom callback sink:
+
+```moonbit
+let hook = Logger::new(
+  callback_sink(fn(rec) {
+    println("callback saw [\{rec.target}] \{rec.message}")
+  }),
+  target="hook",
+)
+
+hook.info("hello")
+```
+
+## Repository Layout
+
+- `bitlogger/`: MoonBit library package, tests, and Mooncake package README
+- `examples/basic/`: runnable example package
+
+## Links
+
+- [Mooncake package page](https://mooncakes.io/docs/Nanaloveyuki/BitLogger)
+- [Chinese README](../README.md)