Created Terminal and Terminal Font detection (markdown)

Terminal-and-Terminal-Font-detection.md

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+**[#252](https://github.com/dylanaraps/neofetch/pull/252)** added support for displaying the terminal emulator in use as well as the font<br \>
+the terminal emulator is currently using.
+
+# Terminal Detection
+
+#### Mac OS X
+
+Terminal detection works by checking the value of `$TERM_PROGRAM`.
+
+#### All other OS
+
+Terminal detection works by recursively checking parent processes until the result<br \>
+isn't `$SHELL`, `*sh`, `screen` or `tmux`.
+
+This method of detection doesn't work with `tmux` as the parent processes aren't<br \>
+the current shell or the terminal emulator.
+
+# Font Detection
+
+Font detection works by parsing the terminal emulator's config file.
+
+#### Funtion Support
+
+| Terminal Emulator | Config Type | Font Detection |
+| ----------------- | ----------- | -------------- |
+| Gnome-terminal    | Profile     | No             |
+| iTerm2            | Profile     | No             |
+| Konsole           | Profile     | No             |
+| Mintty            | Global      | Yes            |
+| st                | None        | No             |
+| Terminal.app      | N/A         | Yes            |
+| Terminator        | Profile     | No             |
+| Termite           | Global      | Yes            |
+| URxvt             | N/A         | Yes            |
+| Xfce4-terminal    | Global      | Yes            |
+| Xterm             | N/A         | Yes            |
+
+**Profile**: The font info is split based on profiles.<br \>
+**N/A**: A command is used (`xrdb` / `osascript`) to get the font.