add tester keymaps for yushakobo/quick7 (#10282)

* update "Hardware Availability"

* add a section of "How to build"

* update "Hardware Supported"

* add tester keymaps for yushakobo/quick7

* update license headers in keymaps/tester/config.h

Co-authored-by: keyaki-namiki <28521374+keyaki-namiki@users.noreply.github.com>

keyboards/yushakobo/quick7/keymaps/tester/config.h

@@ -0,0 +1,27 @@
+/*
+Copyright 2020 yushakobo
+
+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/>.
+*/
+
+#undef RGBLIGHT_LIMIT_VAL
+#define RGBLIGHT_LIMIT_VAL 150 /* The maximum brightness level */
+#define RGBLIGHT_LAYERS
+#define RGBLIGHT_MAX_LAYERS 4
+#define RGBLIGHT_LED_MAP {\
+    0, 1, 2,\
+    5, 4, 3,\
+    6, 7, 8,\
+    9, 10, 11, 12\
+}