Add user guide for TLS ingress

site/docs/guides/tls.md

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+# TLS Ingress with Minikube
+
+In this guide we walk through the process of configuring a Nessie Service with secure HTTPS transport in
+[Minikube](https://minikube.sigs.k8s.io/docs/).
+
+## Setting up Minikube
+
+1. Start Minikube cluster: `minikube start`
+2. Enable NGINX Ingress controller: `minikube addons enable ingress`
+
+## Creating Certificates
+
+If you have your own trusted certificate you can use it to sign a new certificate for the Nessie service.
+
+Otherwise, the rest of this section shows how can create a self-signed certificate and add it the list of trusted
+certificates in the client OS.
+
+To generate a fresh pair of a key and a (self-signed) certificate:
+
+```shell
+openssl req -new -subj "/CN=Nessie" -addext "subjectAltName = DNS:nessie.local" \
+  -newkey rsa:2048 -keyout nessie-key.pem -out nessie.crt -noenc
+```
+
+Note the `-noenc` option. It is used only for the sake of simplicity of this example deployment. 
+
+Add the new certificate to the local set of CA certificates on the client host (where the Nessie clients,
+such as Nessie CLI / `curl` / browser, are going to run).
+
+The following example is for Linux:
+
+1. `sudo cp nessie.crt /usr/local/share/ca-certificates/nessie.crt`
+2. `sudo update-ca-certificates`
+
+This should output something like "Certificate added: CN=Nessie".
+
+## Creating a k8s Secret for the Nessie Certificate
+
+```shell
+kubectl -n nessie-ns create secret tls nessie-tls \
+  --cert=nessie.crt --key=nessie-key.pem
+```
+
+## Deploying Nessie with Helm
+
+```shell
+helm install nessie -n nessie-ns helm/nessie \
+  --set ingress.enabled=true \
+  --set ingress.hosts[0].host='nessie.local' \
+  --set ingress.hosts[0].paths[0]='/' \
+  --set ingress.tls[0].secretName=nessie-tls \
+  --set ingress.tls[0].hosts[0]='nessie.local'
+```
+
+The deployment process may take some time. Use the following command to check its status and get the ingress IP address.
+
+```shell
+kubectl get ingress -n nessie-ns
+```
+
+Add an entry in the local hosts file (e.g. `/etc/hosts`) mapping that IP address to `nessie.local`, for example:
+
+```shell
+192.168.49.2	nessie.local
+```
+
+Use `curl` to verify that the server is accessible:
+
+```shell
+$ curl https://nessie.local/api/v2/config
+{
+  "defaultBranch" : "main",
+  "minSupportedApiVersion" : 1,
+  "maxSupportedApiVersion" : 2,
+  "actualApiVersion" : 2,
+  "specVersion" : "2.0.0"
+}
+```
+
+## Accessing Nessie UI over HTTPS
+
+Please note that most browsers do not trust self-signed certificates, so an exception will have to be manually
+granted to the "Nessie" certificate.