Create issue template

Author: c9s

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,29 @@
+### Output
+
+...
+
+### Expected Result
+
+...
+
+### Command
+
+Paste your phpbrew install command here (be sure to install with `--debug` flag, e.g. `phpbrew --debug install`)
+
+    phpbrew 
+
+### Build Log
+
+    gist here
+
+### Platform
+
+OS:
+
+    e.g. OS X 10.7, Ubuntu 14.04
+
+Running PHP: 
+
+Installing PHP:
+
+