Adding developer documentation in README.md (#9)

Signed-off-by: Archisman-Mridha <archismanmridha12345@gmail.com>
Co-authored-by: Archisman-Mridha <archismanmridha12345@gmail.com>
Reviewed-on: https://gitea.obmondo.com/EnableIT/kubeaid-bootstrap-script/pulls/9

README.md

@@ -1,5 +1,19 @@
 # KubeAid Bootstrap Script
 
+## Developer Guide
+
+> Make sure, you've Docker installed in your system.
+
+Run `make build-image-dev` to build the KubeAid Bootstrap Script container image (development version).
+
+Then run `make run-container-dev` to run the container.
+
+In a separate terminal window, use `make exec-container-dev` to execute into the container.
+
+Once you're inside the container, use `make generate-sample-config-aws-dev` to generate a sample config file at [./outputs/kubeaid-bootstrap-script.config.yaml](./outputs/kubeaid-bootstrap-script.config.yaml), targetting the AWS cloud provider. Adjust the config file according to your needs.
+
+Then run `make bootstrap-cluster-dev` to bootstrap the cluster!
+
 ## REFERENCES
 
 - [Server-Side Apply](https://kubernetes.io/docs/reference/using-api/server-side-apply/#comparison-with-client-side-apply)