Creates a userspace for keymaps (#1559)

* create a user space

* adds example

* document, add readme.md

* jackhumbert userspace, ergodox keymap

users/jackhumbert/jackhumbert.c

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+#include "jackhumbert.h"

users/jackhumbert/jackhumbert.h

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+#ifndef USERSPACE
+#define USERSPACE
+
+#include "quantum.h"
+
+#endif

users/jackhumbert/readme.md

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+Copyright 2017 Jack Humbert <jack.humb@gmail.com> @jackhumbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.

users/jackhumbert/rules.mk

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+SRC += jackhumbert.c