Create an issue template for BFCL (#599)

Creates a new issue template. 

DOES not change BFCL leaderboard values.

.github/ISSUE_TEMPLATE/bfcl.md

@@ -0,0 +1,28 @@
+---
+name: BFCL
+about: Issue in Berkeley Function Calling Leaderboard
+title: "[BFCL] "
+labels: bfcl
+assignees: ''
+
+---
+
+**Describe the issue**
+A clear and concise description of what the issue is.
+
+**ID datapoint**
+1. Datapoint / Model Handler permalink: 
+2. Issue: 
+2. Gorilla repo commit #: 
+
+**What is the issue**
+
+**Proposed Changes**
+
+{
+ 'previous_datapoint':[], 
+ 'updated_datapoint':[]
+}
+
+**Additional context**
+Add any other context about the problem here.