Added issue template

ISSUE_TEMPLATE.md

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+## Prerequisites
+
+* [ ] Put an X between the brackets on this line if you have done all of the following:
+    * My beacons have Estimote Location packet enabled (Check it in the Estimote Cloud, or via app)
+    * My Android device/devices supports BLE and has Android OS version >= 5.0.0 
+    * My Android device/devices have bluetooth enabled
+    * My app has Location Permissions granted
+
+## Basic information
+
+**Estimote SDK version:** [Paste here the SDK version that you are using (like `0.1.0-alpha.6`)]
+
+**Android devices affected:** [Paste here your Android device model/models that you are having problems with.]
+
+**Android OS version affected:** [Android OS version (ex. `Oreo 8.0.0`)]
+
+**Beacon hardware version:** [Paste here your beacons hardware version (you can check that in Estimote Cloud).] 
+
+## Description
+
+[Description of the issue]
+
+**Steps to reproduce:**
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+## (Optional) Additional information
+```
+Add here any logs you want to attach, or any other info, like pictures for example
+```