Add very rough ROADMAP

ROADMAP.md

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+# Roadmap to v1.0.0
+
+- Supported usage
+  - [ ] Atom
+  - [ ] Sublime
+  - [ ] CLI
+  - [ ] Core (Node.js API)
+
+- [ ] Core
+  - [ ] Standard Options & Languages
+  - [ ] Add Option
+    - Option has fields:
+      - `key`
+      - `description`
+      - `default`
+      - `type`
+      - ...
+  - [ ] Add Language
+    - Language has fields:
+      - `namespace`
+      - `name`
+      - `extensions`
+      - `options`
+  - [ ] Add Beautifier
+    - Supported languages and options
+    - Given `({ text, language, options, filePath, projectPath })`
+    - Beautifiers run in their own processes
+      - Beautifier queue limiting number of simultaneous processes
+  - [ ] Add Configurer
+    - Configurer will obtain values for the options
+- [ ] CLI
+  - [ ] Find beautifiers globally installed named `beautifier-${name}`
+    - See https://github.com/yeoman/environment/blob/f9468481911c31673378b38e63872f57a1163f38/lib/resolver.js#L63
+- [ ] Atom
+  - [ ] Configurers
+    - [ ] Atom Editor Settings
+    - [ ] 
+  - [ ] External Beautifiers
+    - [ ] Services (Consumer/Provider) API
+
+- [ ] Sublime
+  - Use CLI