[sahtu] Added Sahtu Keyboard for Dene Kede language

[RavingRaven4]

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[keyman-server]

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[DavidLRowe]

Thanks for your contribution. You'll want to consult https://help.keyman.com/developer/keyboards/github/ for more details. The first step "Is Your Keyboard Ready?" will help you know what is needed to keep our automated build system happy.

Some specific points:

• Don't include "keyboard" in the keyboard project name as that is redundant. So, "sahtu" (rather than "sahtu_keyboard")
• Include the keyboard under the "s" folder. So, the keyboard project folder will be either release/s/sahtu or experimental/s/sahtu. The release and experimental sections function in the same way. We don't require quite as much user documentation for the experimental section. This allows a keyboard author to get feedback on a published keyboard, then make adjustments in later versions before writing the user documentation.
• There are files missing (LICENSE.md, HISTORY.md), files that shouldn't be included (metadata.json, sahtu.kmp), and files that are misplaced (sahtu.kmn, sahtu.kvks and sahtu.kps) should be in a folder called "source". The link mentioned earlier will give more details. If you use Keyman Developer and the Project menu, New Project menu item, the program will create the file structure with the files in the right places.
• Currently the .kmn file has store(&TARGETS) 'any' which indicates that there should be a sahtu.keyman-touch-layout file with the layout for touch devices, such as phone or tablet. You need to either change the value for &TARGETS to 'desktop web or else add a touch layout.
• For the store(&NAME) field, you can use the actual name of the language.
• The version number in store(&KEYBOARDVERSION) needs to match what you'll put in the HISTORY.md file. The default for an initial keyboadr is 1.0. It's fine to start at 2.0 if that helps you.

If anything is unclear, please write again. You may find it easier to close this pull request and start a new one. That is perfectly fine. (I hope this is not discouraging. I got lots of comments on the first keyboard I submitted and I think I made multiple pull requests before I got it right!)