Add README for how to use jaeger tracing (#3040)

Author: justinsb

porch/config/development/tracing/README.md

@@ -0,0 +1,30 @@
+### How to enable jaeger tracing
+
+If you want to enable jaeger tracing of the porch-server:
+
+* Apply the [deployment.yaml manifest](deployment.yaml) from this directory
+
+```
+kubectl apply -f deployment.yaml
+```
+
+* Add the commented out env var OTEL to the porch-server manifest:
+
+```
+kubectl edit deployment -n porch-system porch-server
+```
+
+```
+        env:
+          # Uncomment to enable trace-reporting to jaeger
+          #- name: OTEL
+          #  value: otel://jaeger-oltp:4317
+```
+
+* Port-forward the jaeger http port to your local machine:
+
+```
+kubectl port-forward -n porch-system service/jaeger-http 16686
+```
+
+* Open your browser to the UI on http://localhost:16686