Added documentation

LICENSE

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+Copyright 2015 Knut Ahlers <knut@ahlers.me>
+
+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
+
+    http://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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+# Jimdo / vault-unseal
+
+[![License: Apache v2.0](https://badge.luzifer.io/v1/badge?color=5d79b5&title=license&text=Apache+v2.0)](http://www.apache.org/licenses/LICENSE-2.0)
+
+This small utility is a helper to automatically unlock a [Vault](https://www.vaultproject.io/) instance by having an amount of servers having access to one or multiple tokens.
+
+## Features
+
+- Provide one or multiple tokens for the unseal command
+- `vault-unseal` does check whether the vault instance is locked and tries to unlock if it is locked
+
+## Usage
+
+```bash
+# ./vault-unseal --help
+Usage of ./vault-unseal:
+      --instance="http://127.0.0.1:8200": Vault instance to unlock
+  -1, --oneshot[=true]: Only try once and exit after
+      --sleep=30: How long to wait between sealed-state checks
+      --tokens="": Tokens to try for unsealing the vault instance
+```