Create improvement_suggestion.md

Signed-off-by: Josh Richards <josh.t.richards@gmail.com>

Author: joshtrichards

.github/ISSUE_TEMPLATE/improvement_suggestion.md

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+---
+name: Documentation improvement
+about: Suggest an improvement or report a mistake
+labels: 0. Needs triage
+---
+
+### Thanks for helping improve our documentation! 
+
+* There is always room for improvement!
+* All contributions (changes and change ideas) - from the largest **to the tiniest** - help make Nextcloud better and easier to use!
+
+---
+
+<!-- Please insert your suggestion or idea below this line -->
+
+Example: My amazing idea is [...] <!-- Feel free to delete this line -->
+
+<!-- Please insert your suggestion or idea above this line -->
+
+---
+
+#### Notes
+
+* Please be patient: this is a large open source project that is overseen by a mixture of volunteers and non-volunteers which are all ultimately busy.
+* If your suggestion is a troubleshooting scenario or one you're not 100% certain about, please post for feedback on the [Nextcloud Help Forum](https://help.nextcloud.com) first.
+  - *Then* return here to bring back your experience to help improve the documentation for clarity, etc. (and link back to the forum discussion in your report!)
+
+#### Protip: If you want to help move things along (or just help out in other ways too) here are some suggestions:
+* Look for areas where you can assist - even seemingingly unrelated areas - *because doing so frees up resources for your favorite topics and ideas*.
+* Submit a proposed change - that attempts to addresses your issue - as a pull request.
+* Paricipate in a discussion on some other unresolved [submitted idea ("issues")](https://github.com/nextcloud/documentation/issues) to help move it along.
+* Post a comment or review on someone else's [proposed change ("pull request")](https://github.com/nextcloud/documentation/pulls) to help move it along.