Add a PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## What does the pull request do?
+<!--- Give a bit of background on the PR here. -->
+
+**Scope of this PR:**
+- [ ] fix or update to an existing page
+- [ ] add a new page to the docs
+
+## Checklist
+<!-- Please fill out the checklist below.  -->
+
+**If this is a new Page**
+- [ ] Added the new page to [Summary.md](https://docs.gitbook.com/getting-started/git-sync/content-configuration#summary)
+
+**In any case**
+- [ ] Spell-checking done
+- [ ] Checked if all hyperlinks work
+- [ ] Checked if all images are visible
+
+## Fixed issues
+<!--- If the pull request fixes issue(s) list them like this: 
+Fixes #123
+Fixes #456
+-->