Add documentation

CHANGELOG.md

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+* 0.1.0
+  * Add `build`-command into letter generator
+  * Add `initialize`-command into letter generator

LICENSE.txt

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+Copyright 2017 Dennis Günnewig
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# Letter Generator
+
+This small tool helps you to generate form letters.
+
+
+## Usage
+
+### Install
+
+~~~bash
+go get github.com/maxmeyer/letter-generator-go
+~~~
+
+### Initialize
+
+This will look for `~/.local/share/letter-template/.git` and for a defined
+remote repository.
+
+* Setup current directory:
+
+  ~~~
+  lg init -V
+  ~~~
+
+* Setup given directory:
+
+  ~~~
+  lg init -V my/dir
+  ~~~
+
+### Build
+
+This will build the letters. Make sure you've initialized the directory before.
+
+~~~
+lg build -V
+~~~
+
+After building letters, you will find a directory called `letters` in the
+current directory.
+
+## Copyright
+
+(c) 2017, Dennis Günnewig
+