Introduce Booths and Call for Booths to OSEM

app/models/booth.rb

@@ -0,0 +1,16 @@
+class Booth < ActiveRecord::Base
+  belongs_to :conference
+  has_many :booth_requests
+  has_many :users, through: :booth_requests
+
+  validates :title,
+            uniqueness: { case_sensitive: fasle},
+            presence: true
+
+  validates :description,
+            :reasoning,
+            :state,
+            :logo_link
+            :conference_id,
+            presence: true
+end