Added issue template

.github/ISSUE_TEMPLATE.md

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+### Issue checklist
+
+<!--
+Thank you for taking the time to improve this library.
+
+Please include all requested information to save time and help you get a quick solution for your problem. 
+-->
+
+#### I'm submitting a...
+<!-- Select one of the following by adding a "x" -->
+
+- [ ] Bug report
+- [ ] Feature request
+- [ ] Documentation issue or request
+- [ ] Support request
+- [ ] Regression
+
+#### Environment
+
+<!-- 
+If your issue request is a bug, regression or support include the environment where you run your code so we can reproduce it. 
+
+Replace *(major.minor.patch)* with your installed version number of each module, eg: 3.1.4
+
+For documentation and new features remove the environment block because it doesn't apply to your case and focus on the behavior part below.
+-->
+
+- I'm using `multer-gridfs-storage` version *(major.minor.patch)*
+
+- My installed MongoDb version is *(major.minor.patch)*
+
+- I have Multer *(major.minor.patch)* installed to upload files
+
+<!-- In case it is relevant, also include the following information otherwise remove the text-->
+
+- I'm *(using/not using)* Mongoose connection objects to create storage instances. The Mongoose version installed is *(major.minor.patch)*
+
+- The Node version used to run the code is *(major.minor.patch)*
+
+#### Current behavior
+<!-- Describe the problem. Include source code examples where the problem can be verified -->
+
+
+#### Expected behavior
+<!-- What result did you expected. Include it if the described problem is not explicit enough -->
+