add rails-erd

Gemfile.lock

@@ -86,6 +86,7 @@ GEM
     bootsnap (1.12.0)
       msgpack (~> 1.2)
     builder (3.2.4)
+    choice (0.2.0)
     concurrent-ruby (1.1.10)
     crass (1.0.6)
     debug (1.6.1)
@@ -227,6 +228,11 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
+    rails-erd (1.7.1)
+      activerecord (>= 4.2)
+      activesupport (>= 4.2)
+      choice (~> 0.2.0)
+      ruby-graphviz (~> 1.2)
     rails-html-sanitizer (1.4.3)
       loofah (~> 2.3)
     railties (7.0.3.1)
@@ -247,6 +253,7 @@ GEM
     responders (3.0.1)
       actionpack (>= 5.0)
       railties (>= 5.0)
+    rexml (3.2.5)
     rspec-core (3.11.0)
       rspec-support (~> 3.11.0)
     rspec-expectations (3.11.0)
@@ -264,6 +271,8 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
+    ruby-graphviz (1.2.5)
+      rexml
     ruby2_keywords (0.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -322,6 +331,7 @@ DEPENDENCIES
   pg (~> 1.1)
   puma (~> 5.0)
   rails (~> 7.0.3, >= 7.0.3.1)
+  rails-erd (~> 1.7)
   redis (~> 4.0)
   rspec-rails (~> 5.1)
   sassc-rails