Update README.md

README.md

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 # tmux-launcher
-Tmux launcher app written in mruby
+Tmux launcher app written in mruby (yes, it needs a much better name).
+
+# Usage
+
+In order to use the app, you need a Yaml file named `tmux-launcher.yaml` in
+your home directory. The file should look like this:
+
+```yaml
+session_name:
+  path: session_path # Should be a full path
+  options:
+    key_1: value_1
+    key_2: value_2
+    # ...
+```
+
+Then, when you run `tmux-launcher session_name`, it'll create a new tmux session called
+`session_name` in the path `session_path` with options as declared in the config file.
+
+# Support
+
+It should run on any Unix-like system that supports mruby, understands `fork`, `execvp`, `execlp` and `pipe`.
+
+# Contributing
+
+Contributions welcome! Just don't be an ass to other contributors.