add Gemfile and Procfile

Gemfile

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+source "https://rubygems.org"
+
+gem "grape"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (4.2.0)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    axiom-types (0.1.1)
+      descendants_tracker (~> 0.0.4)
+      ice_nine (~> 0.11.0)
+      thread_safe (~> 0.3, >= 0.3.1)
+    builder (3.2.2)
+    coercible (1.0.0)
+      descendants_tracker (~> 0.0.1)
+    descendants_tracker (0.0.4)
+      thread_safe (~> 0.3, >= 0.3.1)
+    equalizer (0.0.9)
+    grape (0.11.0)
+      activesupport
+      builder
+      hashie (>= 2.1.0)
+      multi_json (>= 1.3.2)
+      multi_xml (>= 0.5.2)
+      rack (>= 1.3.0)
+      rack-accept
+      rack-mount
+      virtus (>= 1.0.0)
+    hashie (3.4.0)
+    i18n (0.7.0)
+    ice_nine (0.11.1)
+    json (1.8.2)
+    minitest (5.5.1)
+    multi_json (1.11.0)
+    multi_xml (0.5.5)
+    rack (1.6.0)
+    rack-accept (0.4.5)
+      rack (>= 0.4)
+    rack-mount (0.8.3)
+      rack (>= 1.0.0)
+    thread_safe (0.3.4)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    virtus (1.0.4)
+      axiom-types (~> 0.1)
+      coercible (~> 1.0)
+      descendants_tracker (~> 0.0, >= 0.0.3)
+      equalizer (~> 0.0, >= 0.0.9)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  grape

Procfile

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+web: bundle exec rackup -p $PORT