Install and set up Devise

Gemfile.lock

@@ -1,3 +1,14 @@
+GIT
+  remote: https://github.com/plataformatec/devise
+  revision: 12fc5b76d89cf6e9c47289416fb24bf1a85f03da
+  specs:
+    devise (4.6.2)
+      bcrypt (~> 3.0)
+      orm_adapter (~> 0.1)
+      railties (>= 4.1.0)
+      responders
+      warden (~> 1.2.3)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -58,6 +69,7 @@ GEM
       zeitwerk (~> 2.1, >= 2.1.8)
     addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
+    bcrypt (3.1.13)
     bindex (0.8.1)
     bootsnap (1.4.4)
       msgpack (~> 1.0)
@@ -109,6 +121,7 @@ GEM
     nio4r (2.4.0)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
+    orm_adapter (0.5.0)
     pg (1.1.4)
     public_suffix (3.1.1)
     puma (3.12.1)
@@ -148,6 +161,9 @@ GEM
     rb-inotify (0.10.0)
       ffi (~> 1.0)
     regexp_parser (1.6.0)
+    responders (3.0.0)
+      actionpack (>= 5.0)
+      railties (>= 5.0)
     rspec-core (3.8.2)
       rspec-support (~> 3.8.0)
     rspec-expectations (3.8.4)
@@ -200,6 +216,8 @@ GEM
     turbolinks-source (5.2.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
+    warden (1.2.8)
+      rack (>= 2.0.6)
     web-console (4.0.1)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)
@@ -227,6 +245,7 @@ DEPENDENCIES
   bootsnap (>= 1.4.2)
   byebug
   capybara (>= 2.15)
+  devise!
   factory_bot_rails
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)