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

Signed-off-by: thomasgouveia <gouveia.thomas@outlook.fr>

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 [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 Logs Bridge API](https://pkg.go.dev/go.opentelemetry.io/otel/log).