docs: update build scripts and .md files (#113)

* docs: add more on Contributing and Get Help

* chore: update build scripts

* docs: update DevelopmentWorkflow.md

* docs: update .md files

* docs: update DevelopmentWorkflow.md

* docs: update development workflow on Win

DevelopmentWorkflow.md

@@ -0,0 +1,63 @@
+# Development Workflow
+
+<!-- TOC depthFrom:2 -->
+
+- [Prerequisites](#prerequisites)
+- [How to Build the Package](#how-to-build-the-package)
+- [How to Build Android](#how-to-build-android)
+- [How to Build iOS](#how-to-build-ios)
+- [How to Use in an Application](#how-to-use-in-an-application)
+
+<!-- /TOC -->
+
+## Prerequisites
+
+Install your native toolchain and NativeScript as described in the docs: https://docs.nativescript.org/setup/quick-setup. In order to open the native Android and iOS project, you need Android Studio and Xcode respectively.
+
+## How to Build the Package
+
+On macOS you can execute:
+
+```shell
+$ ./build.sh
+```
+
+This script builds both Android and iOS, assembles the package at `./dist/package` and packs it as `./dist/tns-core-modules-widgets-*.tgz`.
+
+## How to Build Android
+
+On Unix-like operating systems you can execute:
+
+```shell
+$ ./build.android.sh
+```
+This script builds only the Android project, assembles the package at `./dist/package` and packs it as `./dist/tns-core-modules-widgets-*.tgz`. The output file is available at `./android/widgets/build/outputs/aar/widgets-release.aar`.
+
+**NOTE:** To run bash script on Windows you can install [GIT SCM](https://git-for-windows.github.io/) and use Git Bash.
+
+## How to Build iOS
+
+On macOS you can execute:
+
+```shell
+$ ./build.ios.sh
+```
+This script builds only the Xcode project, assembles the package at `./dist/package` and packs it as `./dist/tns-core-modules-widgets-*.tgz`. The output native iOS framework is available at `./ios/TNSWidgets/build/TNSWidgets.framework`.
+
+## How to Use in an Application
+
+You could link the `tns-core-modules-widgets` plugin package to your application through the steps listed below.
+
+In the `./dist/package` folder execute:
+
+```
+npm link
+```
+
+In your application project folder execute:
+
+```
+npm link tns-core-modules-widgets
+```
+
+Build the plugin with the above-mentioned commands after each change you would like to test.