Update issue templates

Added issue template for error report.

Author: agarcialeon

.github/ISSUE_TEMPLATE/error-report.md

@@ -0,0 +1,16 @@
+---
+name: Error Report
+about: Report an error (typo, missing link, repeated item...) from the content in
+  the list.
+title: "[Error Report] - Error short description"
+labels: bug
+assignees: agarcialeon
+
+---
+
+**Describe the error, indicating the section where we can find it: **
+_
+
+
+**Propose a fix (if you know how to fix it):**
+_