Add rubocop & solargraph as development dependency

Gemfile

@@ -43,6 +43,8 @@ group :development do
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
   gem 'railroady'
+  gem 'rubocop'
+  gem 'solargraph'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem

Gemfile.lock

@@ -43,11 +43,13 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (9.0.0)
+    ast (2.4.0)
     bcrypt (3.1.12)
     bootsnap (1.3.2)
       msgpack (~> 1.0)
     builder (3.2.3)
     byebug (10.0.2)
+    coderay (1.1.2)
     concurrent-ruby (1.0.5)
     crass (1.0.4)
     devise (4.5.0)
@@ -60,11 +62,15 @@ GEM
       devise (> 3.5.2, < 4.6)
       rails (>= 4.2.0, < 6)
     erubi (1.7.1)
+    eventmachine (1.2.7)
     ffi (1.9.25)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
+    htmlentities (4.3.4)
     i18n (1.1.1)
       concurrent-ruby (~> 1.0)
+    jaro_winkler (1.5.1)
+    kramdown (1.17.0)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -86,6 +92,10 @@ GEM
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     orm_adapter (0.5.0)
+    parallel (1.12.1)
+    parser (2.5.3.0)
+      ast (~> 2.4.0)
+    powerpack (0.1.2)
     puma (3.12.0)
     rack (2.0.5)
     rack-test (1.1.0)
@@ -115,6 +125,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
+    rainbow (3.0.0)
     rake (12.3.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
@@ -122,7 +133,29 @@ GEM
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
+    reverse_markdown (1.1.0)
+      nokogiri
+    rubocop (0.60.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.5, != 2.5.1.1)
+      powerpack (~> 0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 1.4.0)
+    ruby-progressbar (1.10.0)
     ruby_dep (1.5.0)
+    solargraph (0.28.4)
+      coderay (~> 1.1)
+      eventmachine (~> 1.2, >= 1.2.5)
+      htmlentities (~> 4.3, >= 4.3.4)
+      kramdown (~> 1.16)
+      parser (~> 2.4)
+      reverse_markdown (~> 1.0, >= 1.0.5)
+      rubocop (~> 0.52)
+      thor (~> 0.19, >= 0.19.4)
+      tilt (~> 2.0)
+      yard (~> 0.9)
     spring (2.0.2)
       activesupport (>= 4.2)
     spring-watcher-listen (2.0.1)
@@ -138,13 +171,16 @@ GEM
     sqlite3 (1.3.13)
     thor (0.20.0)
     thread_safe (0.3.6)
+    tilt (2.0.8)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
+    unicode-display_width (1.4.0)
     warden (1.2.7)
       rack (>= 1.0)
     websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
+    yard (0.9.16)
 
 PLATFORMS
   ruby
@@ -158,6 +194,8 @@ DEPENDENCIES
   puma (~> 3.11)
   railroady
   rails (~> 5.2.1)
+  rubocop
+  solargraph
   spring
   spring-watcher-listen (~> 2.0.0)
   sqlite3