Merge pull request #2 from hatappi/readme-sample

Add Readme.md and sample

Author: hatappi

README.md

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+This is [Packer Provisioner Plugin](https://www.packer.io/docs/extending/custom-provisioners.html) for use [MItamae](https://github.com/itamae-kitchen/mitamae).
+
+## Installation
+
+```sh
+# require go, git
+$ go get github.com/hatappi/packer-provisioner-mitamae
+```
+
+## Usage
+
+Add the provisioner to packer file.
+
+```json
+{
+  "builders": [ ... ],
+  "provisioners": [{
+    "type": "mitamae",
+    "recipe_path": "/tmp/recipe.rb"
+  }]
+}
+```
+
+sample is [here](./sample)
+
+## Configuration
+**Required**
+
+- recipe_path (string) : recipe path of remote server.
+
+**Optional**
+
+- mitamae_version (string) : MItamae version. By default this is v1.4.5.
+- bin_dir (string) : bin_dir is is the path to download MItamae. By default this is `/usr/local/bin`
+- option (string) : It is an option when execute `mitamae local`. For example '-l debug'

sample/docker.json

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+{
+  "builders":[{
+    "type": "docker",
+    "image": "ubuntu",
+    "export_path": "image.tar"
+  }],
+  "provisioners": [
+    {
+      "type": "file",
+      "source": "./recipe.rb",
+      "destination": "/tmp/recipe.rb"
+    },
+    {
+      "type": "shell",
+      "inline": ["apt-get update -y", "apt-get install wget -y"]
+    },
+    {
+      "type": "mitamae",
+      "recipe_path": "/tmp/recipe.rb"
+    }
+  ],
+  "post-processors": [
+    [
+      {
+        "type": "docker-import",
+        "repository": "packer-provisioner-mitamae/sample"
+      }
+    ]
+  ]
+}

sample/recipe.rb

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+directory '/tmp/etc'
+
+file '/tmp/etc/hello' do
+  content "Welcome to packer-provisioner-mitamae\n"
+end