Create advanced-nginx-settings.md

docs/guides/advanced-nginx-settings.md

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+Every cluster provisioned by Porter by default uses an NGINX [ingress controller](https://kubernetes.github.io/ingress-nginx) to connect your web applications to the internet. There are different options for customizing the NGINX configuration that a specific application uses. 
+
+Most of the time, you can customize the NGINX configuration by adding an "Ingress Annotation" when deploying a web service. This can be found in the "Advanced" tab of the web template:
+
+![Advanced tab ingress](https://files.readme.io/fcfa8a2-Screen_Shot_2021-06-02_at_5.15.26_PM.png "Screen Shot 2021-06-02 at 5.15.26 PM.png")
+
+To add an annotation, simply click "Add row" and add key-value pairs for the annotation. 
+
+> 📘
+>
+> **Note:** this document attempts to cover the most common use-cases. To view the full list of annotations, [go here](https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations).
+
+# NGINX Settings Options
+
+## Client Max Body Size 
+
+If you are getting undesired `413 Request Entity Too Large` errors, you can increase the maximum size of the client request by setting the field [client_max_body_size](http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size). You can do this by adding the following annotation:
+
+```yaml
+nginx.ingress.kubernetes.io/proxy-body-size: 8m
+```
+
+This will set the maximum client request body size to 8 megabytes. [Read more about NGINX units](http://nginx.org/en/docs/syntax.html).