Add README file for auto instrumentation

Author: duncanpo

README.md

@@ -101,6 +101,9 @@ otelcol --config <otelcol-config-yaml>
 
 For more examples, see the "examples" folder.
 
+## Automatic Instrumentation
+See example [here](auto-instrumentation/README.md).
+
 ## Help
 To view documentation of individual function, type "help \<function_name>\". For example,
 ```

auto-instrumentation/README.md

@@ -0,0 +1,35 @@
+# Automatic Instrumentation
+
+Automatic instrumentation provides a way to instrument MATLAB code with OpenTelemetry data without requiring any code changes.
+
+## AutoTrace
+With AutoTrace enabled, spans are automatically started at function beginnings and ended when functions end. By default, AutoTrace instruments the input function and all of its dependencies. An example workflow is as follows:  
+```
+% The example functions should be on the path when calling AutoTrace
+addpath("myexample");
+
+% Configure a tracer provider and set it as the global instance
+tp = opentelemetry.sdk.trace.TracerProvider;   % use default settings
+setTracerProvider(tp);
+
+% Instrument the code
+at = opentelemetry.autoinstrument.AutoTrace(@myexample, TracerName="AutoTraceExample");
+
+% Start the example
+beginTrace(at);
+```
+Using the `beginTrace` method ensures proper error handling. In the case of an error, `beginTrace` will end all spans and set the "Error" status.
+
+Alternatively, you can also get the same behavior by inserting a try-catch in the starting function.
+```
+function myexample(at)
+% wrap a try catch around the code
+try
+    % example code goes here
+catch ME
+    handleError(at);
+end
+```
+With the try-catch, `beginTrace` method is no longer necessary and you can simply call `myexample` directly and pass in the AutoTrace object.
+
+To disable automatic tracing, delete the object returned by `AutoTrace`.