Provide helpful instructions in new app README (#273)

Author: hanarimawi

lib/hanami/cli/generators/gem/app/readme.erb

@@ -1 +1,15 @@
 # <%= camelized_app_name %>
+
+Welcome to your Hanami app!
+
+## Getting Started
+
+- Run the server with `bin/dev`
+- View the app at [http://localhost:2300](http://localhost:2300)
+- Run the tests with `bundle exec rake`
+
+## Useful Links
+
+- [Hanami Home](http://hanamirb.org)
+- [Hanami Guides](https://guides.hanamirb.org/)
+- [Hanami API Doc](https://gemdocs.org/gems/hanami/latest)

spec/unit/hanami/cli/commands/gem/new_spec.rb

@@ -126,6 +126,20 @@
       # README.md
       readme = <<~EXPECTED
         # #{inflector.camelize(app)}
+
+        Welcome to your Hanami app!
+
+        ## Getting Started
+
+        - Run the server with `bin/dev`
+        - View the app at [http://localhost:2300](http://localhost:2300)
+        - Run the tests with `bundle exec rake`
+
+        ## Useful Links
+
+        - [Hanami Home](http://hanamirb.org)
+        - [Hanami Guides](https://guides.hanamirb.org/)
+        - [Hanami API Doc](https://gemdocs.org/gems/hanami/latest)
       EXPECTED
       expect(fs.read("README.md")).to eq(readme)
       expect(output).to include("Created README.md")
@@ -590,6 +604,20 @@ class Operation < Dry::Operation
         # README.md
         readme = <<~EXPECTED
           # #{inflector.camelize(app)}
+
+          Welcome to your Hanami app!
+  
+          ## Getting Started
+  
+          - Run the server with `bin/dev`
+          - View the app at [http://localhost:2300](http://localhost:2300)
+          - Run the tests with `bundle exec rake`
+  
+          ## Useful Links
+  
+          - [Hanami Home](http://hanamirb.org)
+          - [Hanami Guides](https://guides.hanamirb.org/)
+          - [Hanami API Doc](https://gemdocs.org/gems/hanami/latest)
         EXPECTED
         expect(fs.read("README.md")).to eq(readme)
         expect(output).to include("Created README.md")
@@ -1125,6 +1153,20 @@ module Types
       # README.md
       readme = <<~EXPECTED
         # #{inflector.camelize(app)}
+
+        Welcome to your Hanami app!
+
+        ## Getting Started
+
+        - Run the server with `bin/dev`
+        - View the app at [http://localhost:2300](http://localhost:2300)
+        - Run the tests with `bundle exec rake`
+
+        ## Useful Links
+
+        - [Hanami Home](http://hanamirb.org)
+        - [Hanami Guides](https://guides.hanamirb.org/)
+        - [Hanami API Doc](https://gemdocs.org/gems/hanami/latest)
       EXPECTED
       expect(fs.read("README.md")).to eq(readme)