Add an issue template

ISSUE_TEMPLATE.md

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+
+# Please follow the general troubleshooting steps first:
+
+- [ ] Update your protoc to the [latest version](https://github.com/google/protobuf/releases) 
+- [ ] Update your copy of `grpc-gateway` to the latest version from github. with 
+  `git fetch https://github.com/grpc-ecosystem/grpc-gateway master && git reset --hard FETCH_HEAD`
+- [ ] Delete the `protoc-gen-grpc-gateway` and `protoc-gen-swagger` binary from your `PATH`,
+  and install locally built binaries.
+
+### Bug reports:
+
+Fill in the following sections with explanations of what's gone wrong.
+
+Steps you follow to reproduce the error:
+
+<!-- Example steps
+1.  I grab my catapult
+2.  I load it with lettuce
+3.  Press the fire button
+4.  It falls over
+-->
+
+Your steps here.
+
+What did you expect to happen instead:
+
+<!-- Example answer
+1.  It would have rained lettuce from the sky bringing forth a cuddly army of bunnies we could
+    play with
+-->
+
+Your answer here.
+
+What's your theory on why it isn't working:
+
+<!-- Example answer
+Evil wizards are hoarding the bunnies and don't want to share. The wizards are casting 
+lettuce protection spells so the cattapult won't work.
+-->
+
+Your theory here.