Update README with instructions for adding or editing libraries.

Author: sebadoom

README.md

@@ -4,6 +4,81 @@
 
 [![Build Status](https://travis-ci.org/jsonwebtoken/jsonwebtoken.github.io.png?branch=master)](https://travis-ci.org/jsonwebtoken/jsonwebtoken.github.io)
 
+### How to add a library
+To add a library, simply edit the `data.json` file located at `views/website/libraries`.
+
+If you add a new language, you will need to provide a proper icon for it and place it in the `img` folder.
+
+Here's a commented example of a language + library definition. All fields must have valid values unless noted:
+
+```javascript
+// Language name (unique)
+".NET": {
+
+  // Unique identifier that will be used as a CSS class
+  // for this language (only valid CSS class names).
+  "uniqueClass": "net",
+  
+  // The language icon, SVG format preferred, should be placed
+  // in /img directory.
+  "image": "/img/1.svg",
+  
+  // The color of header that displays the name of the language
+  // and the icon. This is a valid CSS color definition.
+  "bgColor": "rgb(42, 168, 229)",
+  
+  // An array of libraries for this language.
+  "libs": [
+    {
+      // In case the library suffered from a vulnerability, the
+      // minimum version in which the vuln was fixed must be
+      // listed here. Optional (can be null).
+      "minimumVersion": "1.0.1", // or null
+      
+      // Supported features, true for supported,
+      // false for not supported.
+      "support": {
+        "sign": true,
+        "verify": true,
+        "iss": true,
+        "sub": true,
+        "aud": true,
+        "exp": true,
+        "nbf": true,
+        "iat": true,
+        "jti": true,
+        "hs256": true,
+        "hs384": true,
+        "hs512": true,
+        "rs256": true,
+        "rs384": true,
+        "rs512": true,
+        "es256": true,
+        "es384": true,
+        "es512": true
+      },
+      
+      // Author URL, can be GitHub profile, personal page
+      // company page, etc. Can be null.
+      "authorUrl": "https://www.microsoft.com", // or null
+      
+      // Author name.
+      "authorName": "Microsoft",
+      
+      // For the star count, this is the GitHub repository path,
+      // (usually user/repo). Can be null (no star count shown).
+      "gitHubRepoPath": "AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet", // or null
+      
+      // URL for source code.
+      "repoUrl": "https://github.com/MSOpenTech/azure-activedirectory-identitymodel-extensions-for-dotnet",
+      
+      // Install command, can be HTML or plain text.
+      "installCommandHtml": "Install-Package<br><a href=\"https://www.nuget.org/packages/System.IdentityModel.Tokens.Jwt/\">System.IdentityModel.Tokens.Jwt</a>"
+    }
+  ]
+}
+```
+
 ### How to build
 
 First, install the required dependencies:
@@ -18,7 +93,9 @@ In order to build (and run) the project execute:
 grunt
 ```
 
-You will find the generated files in the `dist` directory. For the website, you can run a server at its root. For example: `http-server dist/website`.
+You will find the generated files in the `dist` directory. For the website, you can run a server at its root. For example: `http-server dist/website`. The default `grunt` task runs a server
+at [https://127.0.0.1:8000](https://127.0.0.1:8000) and watches
+for changes.
 
 To run tests, execute:
 
@@ -29,5 +106,3 @@ grunt test
 Look at the end of the `Gruntfile` for other common tasks.
 
 ### Happy hacking!
-
-