add License & simple Readme

LICENSE

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+   Kubeconform - Validate Kubernetes configuration files
+
+   Copyright (C) 2020 Yann Hamon
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       https://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

Readme.md

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+# Kubeconform
+
+A Kubernetes manifests validation tool, inspired by & similar to [Kubeval](https://github.com/instrumenta/kubeval)
+
+```
+$ ./bin/kubeconform -h
+Usage of ./bin/kubeconform:
+  -dir value
+        directory to validate (can be specified multiple times)
+  -file value
+        file to validate (can be specified multiple times)
+  -k8sversion string
+        version of Kubernetes to test against (default "1.18.0")
+  -output string
+        output format - text, json (default "text")
+  -skipKinds string
+        comma-separated list of kinds to ignore
+```