Add .env.sample

Ignore .env.

.env.sample

@@ -0,0 +1,8 @@
+PASSWORD_SEED="yourpasswordseed"
+MONGO_URI="mongodb://localhost/crowi"
+ELASTICSEARCH_URI="localhost:9200"
+REDIS_URL="localhost"
+FILE_UPLOAD="local"
+PORT=3000
+NODE_ENV="development"
+SECRET_TOKEN=""

.gitignore

@@ -4,3 +4,4 @@ bower_components/
 public/js/*
 public/css/*
 public/uploads/*
+.env