README: Add instructions on how to install and use.

Signed-off-by: Akshat <akshat25iiit@gmail.com>

.gitignore

@@ -19,3 +19,6 @@
 
 # Go workspace file
 go.work
+
+# harbor compiled file
+harbor

README.md

@@ -1,2 +1,35 @@
 # harbor-cli
 Official Harbor CLI
+
+# How to Install:
+
+- Run `go mod download` to install the dependencies
+- Run `go build -o harbor` to generate the build file
+
+# How to Use:
+
+If you have completed the above steps, now you are all set to use this project.
+<br>
+<br>
+`./harbor --help` or do `./harbor help`:
+```shell
+Official Harbor CLI
+
+Usage:
+  harbor [command]
+
+Available Commands:
+  completion  Generate the autocompletion script for the specified shell
+  create      create project, registry, etc.
+  delete      delete project, registry, etc.
+  get         get project, registry, etc.
+  help        Help about any command
+  list        list project, registry, etc.
+  login       Log in to Harbor registry
+  update      update registry, etc.
+
+Flags:
+  -h, --help   help for harbor
+
+Use "harbor [command] --help" for more information about a command.
+```