add README.md

Author: cleverchuk

instrumentation/android-log/README.md

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+# Android Log Instrumentation
+
+Status: experimental
+
+The Android Log instrumentation transforms calls to `android.uti.Log.x` to emit
+OTEL log record.
+
+## Telemetry
+
+This instrumentation produces the following telemetry:
+
+### Log
+
+* Type: Log
+* Description: A log message
+* Attributes:
+    * `android.log.tag`: The tag passed to `android.uti.Log.x`
+    * `exception.stacktrace` ([see semconv here](https://github.com/open-telemetry/semantic-conventions/blob/727700406f9e6cc3f4e4680a81c4c28f2eb71569/docs/attributes-registry/exception.md#exception-stacktrace))
+    * `exception.type` ([see semconv here](https://github.com/open-telemetry/semantic-conventions/blob/727700406f9e6cc3f4e4680a81c4c28f2eb71569/docs/attributes-registry/exception.md#exception-type))