Create crash.md

docs/api/crash.md

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+# Crash Reporting
+
+RNFirebase provides crash reporting for your app out of the box. Please not crashes do not appear in real-time on the console,
+they tend to take a number of hours to appear.
+
+## Manual Crash Reporting
+
+If you want to manually report a crash, such as a pre-caught exception this is possible by using the `report` method. 
+
+```javascript
+try {
+  initSomeSDK();
+} catch (e) {
+  firebase.crash().log('Some SDK failed to boot!');
+  firebase.crash().report(e);
+}
+```
+
+### log
+
+Logs a message that will appear in a subsequent crash report.
+
+`firebase.crash().log(String message);`
+
+### logcat
+
+- **Android**: Logs a message that will appear in a subsequent crash report as well as in [logcat](https://developer.android.com/studio/command-line/logcat.html).
+- **iOS**: Logs the message in the subsequest crash report only (same as `log`).
+
+`firebase.crash().logcat(int level, String tag, String message);`
+
+### report
+
+Files a crash report, along with any previous logs to Firebase. An [Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error) object must be passed into the report method.
+
+`firebase.crash().report(Error)`.