Add docs for installing Kyma with Knative from sources (kyma-project#…

…1908)

docs/kyma/docs/038-inst-knative.md

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+---
+title: Installation with Knative
+type: Installation
+---
+
+You can install Kyma with [Knative](https://cloud.google.com/knative/) and use its solutions for handling events and serverless functions.
+
+## Knative with local deployment from sources
+
+When you install Kyma locally from sources, add the `--knative` argument to the `run.sh` script. Run this command:
+
+```
+./run.sh --knative
+```
+
+## Knative with a GKE cluster deployment from sources
+
+To install Kyma with Knative when deploying on a GKE cluster from sources, follow the instructions outlined in the **Install Kyma on a GKE cluster** installation guide.
+
+To prepare the `my-kyma.yaml` configuration file that installs Kyma with Knative on a GKE cluster, run:
+
+```
+cat installation/resources/installer.yaml <(echo -e "\n---") installation/resources/installer-config-cluster.yaml.tpl  <(echo -e "\n---") installation/resources/installer-cr-cluster.yaml.tpl | sed -e "s/__KNATIVE__/true/g | sed -e "s/__DOMAIN__/$DOMAIN/g" |sed -e "s/__TLS_CERT__/$TLS_CERT/g" | sed -e "s/__TLS_KEY__/$TLS_KEY/g" | sed -e "s/__.*__//g" > my-kyma.yaml
+```