Introduce library skeleton

We use the BSD-3-Clause license for this library glue code.

Signed-off-by: Charalampos Mainas <Charalampos.Mainas@neclab.eu>
Reviewed-by: Costin Lupu <costin.lupu@cs.pub.ro>

diff --git a/.gitignore b/.gitignore
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+*.depend
+*.o
+*.a
+*.d
+*.so
+*.orig
+*.rej
+*.bak
+*.swp
+*~
+,*
+\#*\#
+.\#*
+\#_*\#
+.\#_*
+!.gitignore
+.*
+
+# gnu global files
+GPATH
+GRTAGS
+GSYMS
+GTAGS
+
+# cscope files
+cscope.*
+ncscope.*

diff --git a/CODING_STYLE.md b/CODING_STYLE.md
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+++ b/CODING_STYLE.md
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+Coding Style
+============
+
+Please refer to the `CODING_STYLE.md` file in the main Unikraft repository.

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+Contributing to Unikraft
+========================
+
+Please refer to the `CONTRIBUTING.md` file in the main Unikraft repository.

diff --git a/COPYING.md b/COPYING.md
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+License
+=======
+
+Unikraft libucontext wrappers
+----------------------------------
+
+This repository contains wrapper code to build libucontext 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) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+
+       Redistribution and use in source and binary forms, with or without
+       modification, are permitted provided that the following conditions
+       are met:
+
+       1. Redistributions of source code must retain the above copyright
+          notice, this list of conditions and the following disclaimer.
+       2. Redistributions in binary form must reproduce the above copyright
+          notice, this list of conditions and the following disclaimer in the
+          documentation and/or other materials provided with the distribution.
+       3. Neither the name of the copyright holder nor the names of its
+          contributors may be used to endorse or promote products derived from
+          this software without specific prior written permission.
+
+       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+       AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+       IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+       ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+       LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+       CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+       SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+       INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+       CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+       ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+       POSSIBILITY OF SUCH DAMAGE.
+

diff --git a/Config.uk b/Config.uk
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+config LIBUCONTEXT
+       bool "ucontext.h API"
+       default n
+       select LIBNEWLIBC
+
+if LIBUCONTEXT
+endif

diff --git a/MAINTAINERS.md b/MAINTAINERS.md
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+++ b/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.
+
+       LIBUCONTEXT-UNIKRAFT
+       M:      Felipe Huici <felipe.huici@neclab.eu>
+       L:      minios-devel@lists.xen.org
+       F: *

diff --git a/README.md b/README.md
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+libucontext for Unikraft
+=============================
+
+This is the port of libucontext for Unikraft as external library.
+
+Please refer to the `README.md` as well as the documentation in the `doc/`
+subdirectory of the main unikraft repository.

diff --git a/exportsyms.uk b/exportsyms.uk
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+none