Create issue_template.md

Author: ishigamii

issue_template.md

@@ -0,0 +1,13 @@
+What `react-native` version are you using?
+
+What `react-native-pdf` version are you using?
+
+What platform does your issue occur on? (android/ios/both)
+
+Describe your issue as precisely as possible : 
+  1) Steps to reproduce the issue or to explain in which case you get the issue
+  2) Interesting `logs`
+
+Join a screenshot or video of the problem on the simulator or device?
+
+Show us the code you are using?