Add installation and usage guide

README.md

@@ -2,27 +2,34 @@
 
 Finding Kubernetes Roles bound to a specified ServiceAccount, Group or User.
 
+![screenshot](./img/screenshot.png)
 
-## Design
+## Installation and Usage
 
-```bash
-$ kubectl bindrole test-user
-
-[ServiceAccount] default/test-user
-Secrets:
-* default/test-user-token
-BindedRoles:
-* */edit
-* default/test-role
-
-Policies:
-- Name: default/test-role
-  APIPolicies: |-
-
-  PodSecurityPolicies:  |-
-
-- Name: edit
-  APIPolicies: |-
-  PodSecurityPolicies:  |-
+The easiest way is to download binary from the [release page](https://github.com/Ladicle/kubectl-bindrole/releases).
+You can also download this repository and install it using Makefile.
 
 ```
+$ kubectl-bindrole -h
+
+Usage of kubectl-bindrole:
+      --as string                      Username to impersonate for the operation
+      --as-group stringArray           Group to impersonate for the operation, this flag can be repeated to specify multiple groups.
+      --cache-dir string               Default HTTP cache directory (default "/home/ladicle/.kube/http-cache")
+      --certificate-authority string   Path to a cert file for the certificate authority
+      --client-certificate string      Path to a client certificate file for TLS
+      --client-key string              Path to a client key file for TLS
+      --cluster string                 The name of the kubeconfig cluster to use
+      --context string                 The name of the kubeconfig context to use
+      --insecure-skip-tls-verify       If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+      --kubeconfig string              Path to the kubeconfig file to use for CLI requests.
+  -n, --namespace string               If present, the namespace scope for this CLI request
+      --request-timeout string         The length of time to wait before giving up on a single server request. Non-zero values should contain a corresponding time unit (e.g. 1s, 2m, 3h). A value of zero means don't timeout requests. (default "0")
+  -s, --server string                  The address and port of the Kubernetes API server
+  -k, --subject-kind string            The Kind of subject which is bound Roles. (default "ServiceAccount")
+      --token string                   Bearer token for authentication to the API server
+      --user string                    The name of the kubeconfig user to use
+  -v, --version                        Print command version
+```
+
+This command works both as a kubectl plugin and as a standalone.