[FEATURE] Codegen Dart Dio Support

codegens/dart-dio/.gitignore

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+.DS_Store
+
+#Obj-c files
+*.m
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Coverage directory used by tools like istanbul
+.coverage
+
+# node-waf configuration
+.lock-wscript
+
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+out/
+/.idea/
+pubspec.lock
+pubspec.yaml
+.packages
+snippet.dart
+.dart_tool/

codegens/dart-dio/.npmignore

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+### NPM Specific: Disregard recursive project files
+### ===============================================
+/.editorconfig
+/.gitmodules
+/test
+
+### Borrowed from .gitignore
+### ========================
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Prevent IDE stuff
+.idea
+.vscode
+*.sublime-*
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+.coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+snippet.swift
+
+out/

codegens/dart-dio/README.md

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+
+> Converts Postman-SDK Request into code snippet for Dart dio.
+
+#### Prerequisites
+To run Code-Gen, ensure that you have NodeJS >= v8. A copy of the NodeJS installable can be downloaded from https://nodejs.org/en/download/package-manager.
+
+## Using the Module
+The module will expose an object which will have property `convert` which is the function for converting the Postman-SDK request to swift code snippet.
+
+### convert function
+Convert function takes three parameters
+
+* `request` - Postman-SDK Request Object
+
+* `options` - options is an object which hsa following properties
+    * `indentType` - String denoting type of indentation for code snippet. eg: 'Space', 'Tab'
+    * `indentCount` - The number of indentation characters to add per code level
+    * `trimRequestBody` - Whether or not request body fields should be trimmed
+
+* `callback` - callback function with first parameter as error and second parameter as string for code snippet
+
+##### Example:
+```js
+var request = new sdk.Request('www.google.com'),  //using postman sdk to create request  
+    options = {
+        indentCount: 3,
+        indentType: 'Space',
+        requestTimeout: 200,
+        trimRequestBody: true
+    };
+convert(request, options, function(error, snippet) {
+    if (error) {
+        //  handle error
+    }
+    //  handle snippet
+});
+```
+### Guidelines for using generated snippet
+
+* Since Postman-SDK Request object doesn't provide complete path of the file, it needs to be manually inserted in case of uploading a file.
+
+* This module doesn't support cookies.

codegens/dart-dio/index.js

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+module.exports = require('./lib');