[#1] Fulfil the open-source check-list: implemented example.

example/.gitignore

@@ -0,0 +1,13 @@
+*.beam
+*.log
+*.plt
+*pem
+.DS_Store
+all.coverdata
+bin
+deps
+ebin
+erl_crash.dump
+log
+logs
+.erlang.mk.packages.v2

example/Makefile

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+PROJECT = example
+
+DEPS = cowboy_swagger mixer
+
+dep_mixer          = git https://github.com/inaka/mixer.git      0.1.3
+dep_cowboy_swagger = git https://github.com/inaka/cowboy-swagger 3a376def6779a85ee8e5634ec64a5072d523e59b
+
+include erlang.mk
+
+ERLC_OPTS += +'{parse_transform}'
+
+SHELL_OPTS = -name ${PROJECT}@`hostname` -s ${PROJECT} -config config/sys.config

example/README.md

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+# Cowboy Swagger Example
+
+To try this example, you need GNU `make` , `git` and `Erlang` in your PATH.
+
+```
+  make
+```
+
+To start the example server in a interactive way do this:
+```
+  ./_rel/example/bin/example console
+```
+
+Now, if we point our favorite web browser at [http://localhost:8080/api-docs](http://localhost:4000),
+we should see the swagger API doc.

example/config/sys.config

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+[
+ {example,
+  [
+   {http_port, 8080},
+   {http_listener_count, 10}
+  ]
+ },
+
+ {cowboy_swagger,
+  [
+   {static_files, "priv/swagger"},
+   {global_spec,
+    #{swagger => "2.0",
+      info => #{title => "Example API"},
+      basePath => "/api-docs"
+     }
+   }
+  ]
+ }
+].

example/elvis.config

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+[
+ {
+   elvis,
+   [
+    {config,
+     [#{dirs => ["src"],
+        filter => "*.erl",
+        rules => [{elvis_style, line_length, #{limit => 80,
+                                               skip_comments => false}},
+                  {elvis_style, no_tabs},
+                  {elvis_style, no_trailing_whitespace},
+                  {elvis_style, macro_names},
+                  {elvis_style, macro_module_names},
+                  {elvis_style, operator_spaces, #{rules => [{right, ","},
+                                                             {right, "++"},
+                                                             {left, "++"}]}},
+                  {elvis_style, nesting_level, #{level => 3}},
+                  {elvis_style, god_modules, #{limit => 25}},
+                  {elvis_style, no_if_expression},
+                  {elvis_style, invalid_dynamic_call, #{ignore => [elvis]}},
+                  {elvis_style, used_ignored_variable},
+                  {elvis_style, no_behavior_info},
+                  {
+                    elvis_style,
+                    module_naming_convention,
+                    #{regex => "^([a-z][a-z0-9]*_?)*(_SUITE)?$",
+                      ignore => []}
+                  },
+                  {elvis_style, state_record_and_type},
+                  {elvis_style, no_spec_with_records},
+                  {elvis_style, dont_repeat_yourself, #{min_complexity => 10}}
+                 ]
+       },
+      #{dirs => ["."],
+        filter => "Makefile",
+        rules => [{elvis_project, no_deps_master_erlang_mk, #{ignore => []}},
+                  {elvis_project, git_for_deps_erlang_mk, #{regex => "^https://.*"}}]
+       },
+      #{dirs => ["."],
+        filter => "rebar.config",
+        rules => [{elvis_project, no_deps_master_rebar, #{ignore => []}},
+                  {elvis_project, git_for_deps_rebar, #{ignore => []}}]
+       },
+      #{dirs => ["."],
+        filter => "elvis.config",
+        rules => [{elvis_project, old_configuration_format}]
+       }
+     ]
+    }
+   ]
+ }
+].