Created Installation (markdown)

Installation.md

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+# Installation
+
+## Generic way
+
+You need to install requirements:
+- pip
+- python
+- python-dev
+
+And then install `thefuck` with `pip`:
+
+```bash
+sudo pip install thefuck
+```
+
+## OS X
+
+```bash
+brew install thefuck
+```
+
+## Ubuntu
+
+```bash
+sudo apt-get install python-pip python-dev
+sudo pip install thefuck
+```
+
+## Arch
+
+```bash
+sudo pacman -S thefuck
+```
+