Added readme.md for NPMJS

readme.md

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+# asciidoc-link-check
+Checks if all hyperlinks in an asciidoc file are alive(or dead).
+
+(Uses most of the source code from [markdown-link-check](https://github.com/tcort/markdown-link-check) module)
+
+## Installation
+To add the module to your project, run:
+
+```bash
+npm install --save asciidoc-link-check
+```
+
+To install the command line tool globally, run:
+
+```bash
+npm install -g asciidoc-link-check
+```
+
+## API
+Use the following function:
+
+
+```javascript
+asciidocLinkCheck(asciidoc, callback)
+```
+Accepts a string containing `asciidoc` formatted text and a `callback`, extracts all links and checks if they are alive or dead. Then calls the `callback` with `(err, results)`.
+
+## Examples
+### JavaScript
+
+```javascript
+'use strict';
+
+var asciidocLinkCheck = require('asciidoc-link-check');
+
+asciidocLinkCheck('xref:https://www.google.com[Google]', function (err, results) {
+    if (err) {
+        console.error('Error', err);
+        return;
+    }
+    results.forEach(function (result) {
+        console.log('%s is %s', result.link, result.status);
+    });
+});
+```
+
+### Command Line
+#### Check links for a local file
+
+```bash
+asciidoc-link-check README.adoc
+```
+
+#### Check links for an online file
+
+```bash
+asciidoc-link-check https://github.com/gaurav-nelson/asciidoc-link-check/blob/master/README.adoc
+```
+
+#### Check links from standard input
+
+```bash
+cat *.adoc | asciidoc-link-check
+```