Notebook Instance lifecycle samples (#80)

This PR just contains a sample for the Notebook Instance Lifecycle configuration. 
samples/notebookinstance_lifecycle_config/my-notebookinstance_lifecycle_config.yaml - Sample Notebook Instance Lifecycle configuration
samples/notebookinstance_lifecycle_config/README.md - Guide for using samples

Author: ananth102

samples/notebookinstance_lifecycle_config/README.md

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+# Notebook Instance Lifecycle Configuration sample
+
+## Prerequisites
+
+This sample assumes that you have completed the [common prerequisites](/samples/README.md).
+
+### Create a Notebook Instance Lifecycle Configuration
+This command creates a Notebook Instance Lifecycle configuration.
+Note: The onCreate and onStart fields must be in base64.
+
+```
+$ kubectl apply -f my-notebookinstance_lifecycle_config.yaml
+notebookinstancelifecycleconfig.sagemaker.services.k8s.aws/my-lifecycle-config created
+```
+
+### Update a Notebook Instance Lifecycle Configuration
+This command updates a Notebook Instance Lifecycle configuration.
+```
+$ kubectl apply -f my-notebookinstance_lifecycle_config.yaml
+notebookinstancelifecycleconfig.sagemaker.services.k8s.aws/my-lifecycle-config configured
+```
+### Describe a Notebook Instance Lifecycle Configuration
+This command describes a Notebook Instance Lifecycle Configuration.
+```
+$ kubectl describe NotebookInstanceLifecycleConfig <YOUR LIFECYCLE CONFIG NAME>
+```
+### List Notebook Instance Lifecycle Configurations
+This command lists Notebook Instance Lifecycle Configurations and their last modified times.
+```
+$ kubectl get NotebookInstanceLifecycleConfig 
+```
+### Delete a Notebook Instance Lifecycle Configuration
+This command deletes a Notebook Instance Lifecycle Configuration.
+```
+$ kubectl delete NotebookInstanceLifecycleConfig <YOUR LIFECYCLE CONFIG NAME>
+```

samples/notebookinstance_lifecycle_config/my-notebookinstance_lifecycle_config.yaml

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+apiVersion: sagemaker.services.k8s.aws/v1alpha1
+kind: NotebookInstanceLifecycleConfig
+metadata:
+  name: <YOUR LIFECYCLE CONFIG NAME>
+spec:
+  notebookInstanceLifecycleConfigName: <YOUR LIFECYCLE CONFIG NAME>
+  onStart:
+    - content: ZWNobyAiRW50ZXJpbmcgb25TdGFydCI= #Decodes to echo "Entering onStart"
+  onCreate:
+    - content: ZWNobyAiRW50ZXJpbmcgb25DcmVhdGUi #Decodes to echo "Entering onCreate"