[Keymap] Adding my keymaps for Preonic and XD75 (#6874)

* Added my keymaps

* Update to readmes

* Update keyboards/preonic/keymaps/pitty/config.h

Thanks!

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/preonic/keymaps/pitty/config.h

Thanks!

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/preonic/keymaps/pitty/config.h

Thanks!

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update config.h

* Update keyboards/preonic/keymaps/pitty/keymap.c

Thanks!

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Removed copyrighted material

* Update keyboards/xd75/keymaps/pitty/keymap.c

Thanks!

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update config.h

* Update config.h

* Update config.h

* Update keymap.c

* Update keymap.c

* Update config.h

* Update keymap.c

* Update keyboards/preonic/keymaps/pitty/config.h

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/preonic/keymaps/pitty/config.h

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

keyboards/xd75/keymaps/pitty/config.h

@@ -0,0 +1,19 @@
+/* Copyright 2017 Benjamin Kesselring
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+// place overrides here