Add ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+## WARNING
+READ and FOLLOW next 5 steps, then REMOVE them before posting the issue
+
+1. Follow CONTRIBUTING Guidelines https://github.com/artf/grapesjs/blob/master/CONTRIBUTING.md
+2. Use the GitHub Issues EXCLUSIVELY for BUGS, FEATURE REQUESTS or QUESTIONS
+3. Do a quick SEARCH first, to see if someone else didn't open the same issue
+4. DON'T ASK to create examples/code for you, read DOCS and APIs first, then you can post what you have tried (we'd like to see your code) and what you're unable to achieve
+5. All the statements/questions have to be filled/answered, otherwise, the issue might be CLOSED
+
+## For BUGS
+  1. Are you using the latest release (older versions are NOT supported)?
+      1. If you're not sure, type `grapesjs.version` in console and press ENTER
+  1. Are you facing the bug with your local copy of GrapesJS or with the current demo?
+  1. If a local copy
+      1. Indicate all informations about your OS, browser and GrapesJS version.
+      1. Are you able to reproduce the bug from the demo?
+  1. What is the expected behavior?
+  1. What happens instead?
+  1. If you're able to reproduce the bug indicate all the necessary steps
+  1. Attach screenshots (using KAP/LICEcap), screencasts or live demo
+     1. JSFiddle Starter template https://jsfiddle.net/szLp8h4n
+     1. CodeSandbox Starter template https://codesandbox.io/s/1r0w2pk1vl