📝 Add logger write API docs

docs/api/logger-info.md

@@ -0,0 +1,77 @@
+---
+name: logger-info
+group: api
+category: logging
+update-time: 20260512
+description: Emit an info-level record through the logger using the standard informational severity shortcut.
+key-word:
+    - logger
+    - info
+    - sync
+    - public
+---
+
+## Logger-info
+
+Emit an info-level record through the synchronous logger. This is the convenience wrapper for `log(Level::Info, ...)`.
+
+### Interface
+
+```moonbit
+pub fn[S : Sink] Logger::info(self : Logger[S], message : String, fields~ : Array[Field] = []) -> Unit {}
+```
+
+#### input
+
+- `self : Logger[S]` - Logger that should emit the info record.
+- `message : String` - Informational message text.
+- `fields : Array[Field]` - Optional structured fields attached to the record.
+
+#### output
+
+- `Unit` - No return value. The record is handled according to the logger threshold and sink pipeline.
+
+### Explanation
+
+Detailed rules explaining key parameters and behaviors
+
+- This helper delegates to `log(Level::Info, ...)`.
+- `Info` is the default minimum logger threshold unless changed explicitly.
+- Per-call target override is not exposed here; use `log(...)` if needed.
+- Context fields, filters, patches, and queue wrappers behave exactly as they do for other write methods.
+
+### How to Use
+
+Here are some specific examples provided.
+
+#### When Emit Normal Application Events
+
+When a service should report standard lifecycle milestones:
+```moonbit
+logger.info("service started")
+```
+
+In this example, the log event uses the normal informational severity.
+
+#### When Attach Structured Informational Context
+
+When an info event should include machine-readable metadata:
+```moonbit
+logger.info("request completed", fields=[field("status", "200")])
+```
+
+In this example, the event remains concise while still carrying useful fields.
+
+### Error Case
+
+e.g.:
+- If the logger minimum level is above `Info`, the call returns without writing a record.
+
+- If the event needs an explicit alternate target, use `log(...)` instead of this shortcut.
+
+### Notes
+
+1. This is the most common convenience method for normal application events.
+
+2. Because `Info` is often the default threshold, this helper is a common baseline for examples and docs.
+