[PATCH 13/13] kas: Add Readme.md

[Uladzimir Bely <ubely@ilbers.de>]

Add brief description of `kas-container` usage.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 kas/README.md | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 kas/README.md

diff --git a/kas/README.md b/kas/README.md
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+# Support of kas
+
+[kas](https://github.com/siemens/kas) is a tool to setup bitbake based projects.
+
+Directory `kas` contains required configuration fragments to setup and build
+Isar with `kas-container` script and Kconfig language.
+
+## Requirements
+
+Since kas uses Docker or Podman based containers, users that runs Isar build
+using `kas-container` script should be allowed to run these containers in
+privileged mode.
+
+## Configuring Isar build
+
+```
+./kas/kas-container menu 
+```
+
+This creates `.config.yaml` file in isar root that stores the configuration.
+
+
+## Building Isar after configuration done
+
+```
+./kas/kas-container build
+```
+
+This generates `build/conf/` configuration and starts building Isar using
+kas container. Required image will be downloaded if not yet).
+
+To access bulid shell, the following command can be used:
+
+```
+./kas/kas-container shell
+```
-- 
2.20.1