doc (jkube-kit/doc) : Add documentation for SimpleDockerfileGenerator

Signed-off-by: Rohan Kumar <rohaan@redhat.com>

jkube-kit/doc/src/main/asciidoc/inc/_generator.adoc

@@ -14,6 +14,10 @@ All default generators examine the build information for certain aspects and gen
 |===
 | Generator | Name | Description
 
+| <<generator-simple-dockerfile, Simple Dockerfile>>
+| `dockerfile-simple`
+| Generator for creating Image when user places `Dockerfile` in project base directory.
+
 | <<generator-java-exec,Java Applications>>
 | `java-exec`
 | Generic generator for flat classpath and fat-jar Java applications
@@ -67,6 +71,7 @@ endif::[]
 
 include::generator/_options_common.adoc[]
 
+include::generator/_simple_dockerfile.adoc[]
 include::generator/_java_exec.adoc[]
 include::generator/_spring_boot.adoc[]
 include::generator/_thorntail_v2.adoc[]

jkube-kit/doc/src/main/asciidoc/inc/generator/_simple_dockerfile.adoc

@@ -0,0 +1,11 @@
+[[generator-simple-dockerfile]]
+=== Simple Dockerfile
+
+Simple Dockerfile generator is responsible for creating an opinionated image configuration when user places `Dockerfile` in project's base directory.
+
+This generator gets activated when these conditions are met:
+
+- `Dockerfile` is placed in project's base directory
+- Either `image` configuration is not provided, or `image` configuration provided does not have `build` configured.
+
+Image built with this configuration would use the `Dockerfile` for https://docs.docker.com/reference/cli/docker/image/build/[docker build] and project base directory as https://docs.docker.com/build/building/context/#filesystem-contexts[docker context directory].