add csctl installation docs

Signed-off-by: kranurag7 <anurag.kumar@syself.com>

Author: kranurag7

README.md

@@ -4,10 +4,31 @@
 
 - [CSCTL](#csctl)
   - [Table of Contents](#table-of-contents)
+  - [Installation](#installation)
   - [Introduction](#introduction)
   - [Features of csctl](#features-of-csctl)
   - [Docs](#docs)
 
+## Installation
+To download `csctl` there are two ways. 
+Go to https://github.com/SovereignCloudStack/csctl/releases/latest and then click on the binary. The name of the binary looks similar to this `
+csctl_0.0.2_linux_amd64` for Linux amd64 architecture.
+
+This will download the binary in your `~/Downloads` directory. Use the following commands to move it to your PATH. 
+```bash
+chmod u+x ~/Downloads/csctl_0.0.2_linux_amd64
+sudo mv ~/Downloads/csctl_0.0.2_linux_amd64 /usr/local/bin/csctl
+```
+
+Alternative way of installing the binary is to use `[gh](https://github.com/cli/cli)` command line tool.
+Use the following command to download the latest binary from GitHub. 
+```bash
+gh release download -p 'csctl_*_linux_amd64' -R SovereignCloudStack/csctl
+chmod u+x csctl_0.0.2_linux_amd64
+sudo mv ./csctl_0.0.2_linux_amd64 /usr/local/bin/csctl
+```
+For darwin based systems, the steps are similar, you'll have to choose darwin based binaries instead of linux one mentioned above. You'll also need to update your destination directory.
+
 ## Introduction
 
 The [Cluster Stack Operator](https://github.com/SovereignCloudStack/cluster-stack-operator) facilitates the usage of [Cluster Stacks](https://github.com/SovereignCloudStack/cluster-stacks) by automating all steps that can be automated. It takes Cluster Stacks release assets that consist mainly of two Helm charts, one to deploy in the management cluster, the other one to deploy in the workload clusters, as well as provider-specific node image (build) information.