docs(bridges/otelzap): add README (#5191)

Signed-off-by: thomasgouveia <[email protected]>

Author: thomasgouveia

bridges/otelzap/README.md

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+# OpenTelemetry Zap Log Bridge
+
+[![Go Reference](https://pkg.go.dev/badge/go.opentelemetry.io/contrib/bridges/otelzap.svg)](https://pkg.go.dev/go.opentelemetry.io/contrib/bridges/otelzap)
+
+This package implements a [Log Bridge](https://opentelemetry.io/docs/specs/otel/logs/bridge-api/) for the [Zap](https://github.com/uber-go/zap) logger. This bridge can be used to send logs emitted by application using Zap to an OpenTelemetry compatible endpoint through the [OpenTelemetry Log API](https://pkg.go.dev/go.opentelemetry.io/otel/log).
+
+## Example
+
+Please refer to the [example_test.go](./example_test.go) file for a complete example of how to create a Zap logger using the bridge.
+
+