Add documentation

README.md

 # qbar
+
+qbar is a status command for [sway](https://swaywm.org/) and [i3](https://i3wm.org/).
+
+## Installation
+
+### Compiling from Source
+
+Building qbar requires [stack](https://haskellstack.org/). To build run:
+```
+stack build
+```
+
+You can also use the scripts in the `bin`-directory (all scripts will rebuild the project if required):
+```
+# Launch as swaybar status command while redirecting stderr to shell
+./bin/run-sway
+
+# Run the binary directly (mostly used to control the bar via rpc)
+./bin/run --help
+
+# Install the binary to ~/.local/bin
+./bin/install
+```
+
+## Configuration
+
+Custom configuration is currently only possible from Haskell:
+```
+myConfig :: BarIO ()
+myConfig = do
+  addBlock dateBlock
+
+main :: IO ()
+main = parseOptions >>= runQBar myConfig
+```
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