📝 Polish onboarding and add feature examples

examples/config_build/main.mbt

@@ -0,0 +1,17 @@
+fn main {
+  let config = @lib.parse_logger_config_text(
+    "{\"min_level\":\"debug\",\"target\":\"demo.config\",\"sink\":{\"kind\":\"text_console\",\"text_formatter\":{\"show_timestamp\":false,\"separator\":\" | \",\"template\":\"[{level}] {target} {message}\"}},\"queue\":{\"max_pending\":2,\"overflow\":\"DropOldest\"}}",
+  ) catch {
+    err => {
+      ignore(err)
+      println("invalid config")
+      return
+    }
+  }
+
+  let logger = @lib.build_logger(config)
+  logger.info("queued one")
+  logger.info("queued two")
+  logger.info("queued three")
+  ignore(logger.flush())
+}

examples/config_build/moon.pkg

@@ -0,0 +1,7 @@
+import {
+  "Nanaloveyuki/BitLogger/src" @lib,
+}
+
+options(
+  "is-main": true,
+)