[Keyboard] Add Louhi keyboard (#11244)

* Add Louhi QMK config

* Modify info.json layout

* change compile and flash examples

* Tweak layout, change picture

* Change pictures to Imgur hosted

* Update keyboards/pohjolaworks/louhi/louhi.h

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/louhi.h

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/keymaps/default/keymap.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/keymaps/default/keymap.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/info.json

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/info.json

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/keymaps/default/keymap.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/pohjolaworks/louhi/readme.md

Co-authored-by: Joel Challis <git@zvecr.com>

* Update keyboards/pohjolaworks/louhi/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/pohjolaworks/louhi/keymaps/default/readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/pohjolaworks/louhi/readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Erkki Halinen <erkki-eemeli.halinen@cgi.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/pohjolaworks/louhi/keymaps/default/readme.md

@@ -0,0 +1,5 @@
+# The default keymap for Louhi
+
+Base layer
+
+![Default layout](https://i.imgur.com/FBR3Xpg.png)