doc: move bug reporting instructions to the repository

Mostly taken from
  https://webrtc.github.io/webrtc-org/bugs/
with the updated list of bugtrackers from
  https://webrtc.org/support/bug-reporting
and adding the native logging instructions from
  https://webrtc.github.io/webrtc-org/native-code/logging/

Bug: none
Change-Id: Ifcf1409fc61dfd280105dae9024e275239831eeb
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/189966
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#32463}

docs/native-code/logging.md

@@ -0,0 +1,42 @@
+Native logs are often valuable in order to debug issues that can't be easily
+reproduced. Following are instructions for gathering logs on various platforms.
+
+To enable native logs for a native application, you can either:
+
+  * Use a debug build of WebRTC (a build where `NDEBUG` is not defined),
+    which will enable `INFO` logging by default.
+
+  * Call `rtc::LogMessage::LogToDebug(rtc::LS_INFO)` within your application.
+    Or use `LS_VERBOSE` to enable `VERBOSE` logging.
+
+For the location of the log output on different platforms, see below.
+
+#### Android
+
+Logged to Android system log. Can be obtained using:
+
+~~~~ bash
+adb logcat -s "libjingle"
+~~~~
+
+To enable the logging in a non-debug build from Java code, use
+`Logging.enableLogToDebugOutput(Logging.Severity.LS_INFO)`.
+
+#### iOS
+
+Only logged to `stderr` by default. To log to a file, use `RTCFileLogger`.
+
+#### Mac
+
+For debug builds of WebRTC (builds where `NDEBUG` is not defined), logs to
+`stderr`. To do this for release builds as well, set a boolean preference named
+'logToStderr' to `true` for your application. Or, use `RTCFileLogger` to log to
+a file.
+
+#### Windows
+
+Logs to the debugger and `stderr`.
+
+#### Linux/Other Platforms
+
+Logs to `stderr`.