docs: add basic readme and license

fix #19

LICENSE

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+The MIT License
+
+Copyright (C) 2020 Hannes Diercks
+
+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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+<div align="center">
+  <img 
+    width="150"
+    src="https://user-images.githubusercontent.com/911218/79590208-f6313c80-80d6-11ea-9ecc-67c94f32f4f7.png"
+    alt="BudgetBudget App Icon"
+  />
+</div>
+<h1 align="center">BudgetBudget</h1>
+
+Envelope styled budgeting using your [MoneyMoney](https://moneymoney-app.com/)
+transactions.
+
+## How to use
+
+This app is currently still in development and not officially released.
+If you still want to use it you need to build it yourself. See
+
+## Contributing
+
+You're really welcome to submit Pull Requests and Issues.
+
+Please keep in mind that i'm building this app in my free time and don't plan to
+monetize it.  
+That means all help is really welcome but it might take some time for me to
+respond to issues or review PRs.
+
+### Run the app in development mode
+
+All of the following assume that you're working on a recent version of MacOS and
+have [NodeJS](https://nodejs.org/) installed.
+
+Run the following in your terminal:
+
+```sh
+# check out the source-code
+git clone git@github.com:Xiphe/budgetbudget.git
+cd budgetbudget
+
+# install dependencies
+npm install
+
+# start the app in development mode
+npm start
+```
+
+## License
+
+> The MIT License
+>
+> Copyright (C) 2020 Hannes Diercks
+>
+> 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.