Updated .gitignore to Elixir files

.gitignore

@@ -1,4 +1,11 @@
+# VIM
 *.sw?
+
+# Clojure
 target
 .lein-failures
 .lein-repl-history
+
+# Elixir
+_build
+.formatter.exs

elixir/hello-world/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"elixir","exercise":"hello-world","id":"390c2d5af9e14923a04888ca26699214","url":"https://exercism.io/my/solutions/390c2d5af9e14923a04888ca26699214","handle":"JBiason","is_requester":true,"auto_approve":true}

elixir/rna-transcription/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"elixir","exercise":"rna-transcription","id":"7e721810049d423fbd7faf4291098975","url":"https://exercism.io/my/solutions/7e721810049d423fbd7faf4291098975","handle":"JBiason","is_requester":true,"auto_approve":false}