Update README.md (#959)

Added table of contents as well as additional support/guidance for install, local development, configuration and more descriptions as well.

Co-authored-by: Thomas Lindner <[email protected]>

README.md

@@ -8,22 +8,53 @@
 ![ci](https://github.com/tclindner/npm-package-json-lint/workflows/ci/badge.svg?branch=master)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/e76a30d9-13f0-4691-a49b-454570589de2/deploy-status)](https://app.netlify.com/sites/npmpackagejsonlint/deploys)
 
+- [npm-package-json-lint](#npm-package-json-lint)
+  * [What is npm-package-json-lint?](#what-is-npm-package-json-lint-)
+  * [Install and Use](#install-and-use)
+    + [System Dependencies](#system-dependencies)
+      - [Node](#node)
+    + [Use the cli](#use-the-cli)
+      - [Use cli globally](#use-cli-globally)
+      - [Use cli in project](#use-cli-in-project)
+      - [Using the linter](#using-the-linter)
+        * [From the command line](#from-the-command-line)
+        * [In the program](#in-the-program)
+  * [Custom Configuration](#custom-configuration)
+  * [Local Development](#local-development)
+  * [Documentation](#documentation)
+  * [Migrating from v5.x.x to 6.x.x](#migrating-from-v5xx-to-6xx)
+  * [Migrating from v4.x.x to 5.x.x](#migrating-from-v4xx-to-5xx)
+  * [Migrating from v3.x.x to 4.x.x](#migrating-from-v3xx-to-4xx)
+  * [Migrating from v2.x.x to 3.x.x](#migrating-from-v2xx-to-3xx)
+  * [Migrating from v1.x.x to 2.x.x](#migrating-from-v1xx-to-2xx)
+  * [Migrating from v0.x.x to 1.x.x](#migrating-from-v0xx-to-1xx)
+  * [Contributing](#contributing)
+  * [Release History](#release-history)
+  * [Related](#related)
+  * [License](#license)
 
 ## What is npm-package-json-lint?
 
 npm-package-json-lint helps enforce standards for your package.json file.
+This helps to ensure that your files are of the highest standard and quality.
+It is also customisable to match your specific project guidline requirements/desires.
+It has support for both command line and programmatic usage.
 Currently it can check for:
 
 * validity of data types in nodes. Ex: `name` should always be a string.
 * whether a string is a lowercase
 * whether a version number is a valid
 * the presence of a given module
 * the presence of a pre-release version of a module
+* the presence of an author
+* the presence of any bugs
+* valid dependencies
+* valid licenses
 * and much more!
 
 Please see the [website](https://npmpackagejsonlint.org/docs/rules) for a list of rules.
 
-## How do I install it?
+## Install and Use
 
 First thing first, let's make sure you have the necessary pre-requisites.
 
@@ -44,6 +75,40 @@ First thing first, let's make sure you have the necessary pre-requisites.
 
 * `npm install npm-package-json-lint`
 
+#### Using the linter
+
+##### From the command line
+
+* Once npm-package-json-lint is installed either in the project or globally it can be run with the 
+  following command, `npx npm-package-json-lint`. This will go through the process of linting/validating
+  your code to meet your desired specifications.
+
+##### In the program
+
+* The linter can also be used as a module in the program and the output be displayed via a log message.
+  Adding the following code to your file can accomplish this.
+
+  ```
+  const npmPackageJsonLint = require("npm-package-json-lint");
+  const result = npmPackageJsonLint.lintFiles(["package.json"]);
+  console.log(result);
+  ```
+
+## Custom Configuration
+
+  npm-package-json-lint has the ability to be constomly configured to match your desires.
+  To configure the linter navigate to the .npmpackagejsonlintrc file in the repository and add
+  in or remove your desired rules.
+
+## Local Development
+Follow these steps to get your local environement set up to allow you to contribute to the repository
+
+1. In the terminal, navigate to the directory in which you want the repository to be cloned.
+2. Run this command from the terminal, `git clone https://github.com/tclindner/npm-package-json-lint.git`
+3. After cloning the repository navigate into the project's root directory from the terminal.
+4. Run "npm install" to install the necessary dependencies.
+5. Your local environment is now set up to create PR's and work on different issues
+
 ## Documentation
 
 [Website](https://npmpackagejsonlint.org)