Create ISSUE_TEMPLATE.md

Author: mellistibco

.github/ISSUE_TEMPLATE.md

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+**I'm submitting a ...**  (check one with "x")
+```
+[] bug report => search github for a similar issue or PR before submitting
+[] feature request
+[] support request
+[] general question
+```
+
+**Current behavior (how does the issue manifest):**
+
+**Expected behavior:**
+
+**Minimal steps to reproduce the problem (not required if feature enhancement):**
+
+**What is the motivation / use case for changing the behavior?**
+
+**Please tell us about your environment (Operating system, docker version, browser & verison if webui, etc):**
+
+**Flogo version (CLI & contrib/lib. If unknown, leave empty or state unknown):** 0.X.X
+
+**Additional information you deem important (e.g. issue happens only occasionally):**