Add GitHub Issue and PR templates

Author: cjbj

.github/issue_template.md

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+*Delete irrelevant parts of this template.*
+
+### For general questions:
+
+Describe exactly what you did and what you want to happen.
+Use the questions at the bottom of this template as a guide.
+
+Use Markdown syntax, particularly for code blocks: see https://help.github.com/articles/basic-writing-and-formatting-syntax/
+
+### For installation issues:
+
+Use a gist for screen output and logs: see https://gist.github.com/
+**Do not paste long output into this issue**
+
+Review the install instructions at https://github.com/oracle/node-oracledb/blob/master/INSTALL.md
+
+Review your output and logs.  **Google any errors**
+Try to install in a different way.  Try some potential solutions.
+
+#### Answer the following questions:
+
+1. What error(s) you are seeing?
+
+2. What *exact* command caused the problem (e.g. what command did you try to install with)?  Who were you logged in as?
+
+3. What environment variables did you set?  How *exactly* did you set them?
+
+4. What is your version of Node.js?
+
+5. What is your version of the Oracle client (e.g. Instant Client)?  How was it installed?  Where it is installed?
+
+6. What is your OS and version?
+
+7. What compiler version did you use?

.github/pull_request_template.md

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+Thanks for contributing!
+
+Before submitting PRs for node-oracledb you must have your signed *Oracle Contributor Agreement* accepted.  See https://www.oracle.com/technetwork/community/oca-486395.html
+
+If the problem solved is small, you may find it easier to open an Issue describing the problem and its cause so we can create the fix.
+
+The bottom of your commit message must have the following line using your name and e-mail address as it appears in the OCA Signatories list.
+
+```
+Signed-off-by: Your Name <[email protected]>
+```
+
+This can be automatically added to pull requests by committing with:
+
+```
+git commit --signoff
+````