Documented 06_Envoy examples:

- 01-Envoy-add-response-headers
- 02-envoy-logging

Added section README.md to:
- 05-Sidecar
- 06-Envoy

06-Envoy/README.md

@@ -0,0 +1,45 @@
+
+## Description
+
+This section focuses on configuring the object `EnvoyFilter`.
+
+
+## Heads up
+
+On the example `02-envoy-logging`, it's a requisite to configure Istio's `meshConfig.accessLogFile` as `/dev/stdout`.
+
+During the installation of the cluster itself, can be set with:
+
+```shell
+istioctl install --set profile=default -y --set meshConfig.accessLogFile=/dev/stdout
+```
+
+On the current scenario, I would recommend purging the Istio installation and reinstalling again, as I assume that you
+are testing this examples in a sandbox that you are free to "destroy".
+
+### Purging Istio
+
+```shell
+istioctl uninstall --purge
+```
+
+Then proceed with reinstalling Istio using the command from above.
+
+### What if I don't want to purge Istio?
+
+Modify the IstioOperator similarly as mentioned [here](https://istio.io/latest/docs/tasks/traffic-management/egress/egress-control/#change-to-the-blocking-by-default-policy), and populate the object with the following fields: 
+
+```yaml
+spec:
+  profile: minimal
+  meshConfig:
+    accessLogFile: /dev/stdout
+```
+
+
+## Links of Interest
+
+- https://istio.io/latest/docs/reference/config/networking/envoy-filter/
+- https://istio.io/latest/docs/reference/config/networking/envoy-filter/#EnvoyFilter-ApplyTo
+- https://github.com/istio/istio/wiki/EnvoyFilter-Samples
+- https://istio.io/latest/docs/reference/config/networking/envoy-filter/#EnvoyFilter-Patch-Operation