doc: add issue template for creating a new issue (#348)

.github/ISSUE_TEMPLATE.md

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+<!--
+
+---------------------------------------------------
+BUG BOUNTY REPORT INFORMATION
+---------------------------------------------------
+
+In the interest of further improving the security of the network, we have launched the RaiBlocks Bug Bounty Program.
+
+WARNING! Don't disclose any information for the Raiblocks bug bounty. First, please read the article about our Bug Bounty Program.
+
+https://www.reddit.com/r/RaiBlocks/comments/7makm7/announcing_the_raiblocks_bug_bounty_program/
+
+---------------------------------------------------
+NORMAL BUG REPORT INFORMATION
+---------------------------------------------------
+
+If you are reporting a new issue, make sure that we do not have any duplicates
+already open. You can ensure this by searching the issue list for this
+repository. If there is a duplicate, please close your issue and add a comment
+to the existing issue instead.
+
+If you suspect your issue is a bug, please edit your issue description to
+include the BUG REPORT INFORMATION shown below. If you fail to provide this
+information within 7 days, we cannot debug your issue and will close it. We
+will, however, reopen it if you later provide the information.
+
+-->
+
+**Description of bug:**
+
+<!--
+Does this issue reproduce with the latest release? if you don't use the latest version then please try our latest version.
+
+Briefly describe the problem you are having in a few paragraphs. 
+-->
+
+**Steps to reproduce the issue:**
+1.
+2.
+3.
+
+**Describe the results you received:**
+
+
+**Describe the results you expected:**
+
+
+**Additional information you deem important (e.g. issue happens only occasionally):**
+
+**Environment**:
+
+<!--
+- OS information  
+- (Linux) Kernel (e.g. `uname -a`):
+- Node version
+- (docker node) docker version 
+-->
+
+**logs**
+
+<!--
+
+Can you please provide the RaiBlocks logs for further analysis.
+
+How to find RaiBlocks logs:
+    
+https://github.com/clemahieu/raiblocks/wiki/Log-files
+
+-->