Add documentation

Signed-off-by: Costin Lupu <[email protected]>
Reviewed-by: Florian Schmidt <[email protected]>

CODING_STYLE.md

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+Coding Style
+============
+
+Please refer to the `CODING_STYLE.md` file in the main Unikraft repository.

CONTRIBUTING.md

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+Contributing to Unikraft
+=======================
+
+Please refer to the `CONTRIBUTING.md` file in the main Unikraft repository.

COPYING.md

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+License
+=======
+
+Unikraft pthread-embedded wrappers
+----------------------------------
+
+This repository contains wrapper code to build pthread-embedded with Unikraft.
+Each C code file in this repository should declare who is the
+copyright owner and under which terms and conditions the code is
+licensed. If such a licence note is missing, the following copyright
+notice will apply:
+
+
+	Copyright(C) Year Name, Institution
+
+	This library is free software; you can redistribute it and/or
+	modify it under the terms of the GNU Lesser General Public
+	License as published by the Free Software Foundation; either
+	version 2 of the License, or (at your option) any later version.
+
+	This library is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+	Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public
+	License along with this library in the file COPYING.LIB;
+	if not, write to the Free Software Foundation, Inc.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+

MAINTAINERS.md

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+Maintainers List
+================
+
+For notes on how to read this information, please refer to `MAINTAINERS.md` in
+the main Unikraft repository.
+
+	PTHREAD-EMBEDDED-UNIKRAFT
+	M:	Costin Lupu <[email protected]>
+	L:	[email protected]
+	F: *

README.md

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+pthread-embedded for Unikraft
+=============================
+
+Please refer to the `README.md` as well as the documentation in the `doc/`
+subdirectory of the main unikraft repository.