Add a Help page

Author: mhartl

HELP.md

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+# Rails Tutorial Help
+
+This is the Help page for the [*Ruby on Rails Tutorial*](https://www.railstutorial.org/) (6th Edition) by [Michael Hartl](http://www.michaelhartl.com/).
+
+## General suggestions
+
+Web development is a tricky business, and despite our collective best efforts it’s likely that you’ll run into trouble at some point. If you do, I suggest comparing your code to the [reference implementation of the sample app](https://github.com/mhartl/sample_app_6th_ed) to track down any discrepancies. You can also post your question at [Stack Overflow](https://stackoverflow.com/), but I suggest you do so after trying all the debugging tips listed below.
+
+## Debugging tips
+
+While it’s impossible to anticipate every potential problem, here are
+some debugging tips that might help:
+
+- Have you compared your code to the [reference implementation of the sample app](https://github.com/mhartl/sample_app_6th_ed)?
+- Are you using the [exact gem versions](https://gemfiles-6th-ed.railstutorial.org) (including Rails) used in the
+  tutorial?
+- Did you try Googling the error message?
+- Did you stop the Rails web server (with Ctrl-C) and restart?
+- Did you try stopping Spring using `bin/spring stop`?
+- Did you copy-and-paste from the book’s code? (Experience shows that typing in code, while a better learning technique in general, is error-prone, so when in doubt be sure to copy all code exactly.)
+- Did you try Googling the error message?
+- Did you re-run `bundle install`?
+- Did you try running `bundle update`?
+- Did you examine the Heroku logs using `heroku logs` or `heroku logs --tail`?
+- Did you make sure the `sqlite3` gem is listed only in the `development` and `test` environments in the `Gemfile`?
+- Did you look for the answer at Stack Overflow?
+- Did you try Googling the error message?
+
+If your problem is of a general nature, such as having issues installing
+Rails or configuring your system, I suggest posting to [Stack
+Overflow](http://stackoverflow.com/). This will allow other
+people running into your issue (and not just those following the Rails
+Tutorial) to benefit from the discussion. For issues
+deploying to [Heroku](http://heroku.com/), please contact [Heroku
+technical support](http://support.heroku.com/).
+
+When asking your question on any mailing list or forum, be sure to
+include as much relevant information as possible. To maximize your chances
+of a helpful reply, I especially recommend the article [How To Ask Questions The Smart
+Way](http://www.catb.org/esr/faqs/smart-questions.html) by [Eric
+Raymond](http://www.catb.org/esr/).
+
+## Error reports
+
+Suspected errors, typos, and bugs can be emailed to <[email protected]>. All such reports are gratefully received, but please double-check with the [online version of the tutorial](https://www.railstutorial.org/book) and the [reference implementation](https://github.com/mhartl/sample_app_6th_ed) before submitting.
+