doc: git mv to .md

* doc: rename .markdown references in content
* doc: rename to .md in tools
* doc: rename to .md in CONTRIBUTING.md

PR-URL: https://github.com/nodejs/node/pull/4747
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: techjeffharris
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 29 insertions, 0 deletions

diff --git a/doc/api/synopsis.md b/doc/api/synopsis.md
new file mode 100644
index 0000000000..7dd3b8fe99
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+# Synopsis
+
+<!--type=misc-->
+
+An example of a [web server][] written with Node.js which responds with
+`'Hello World'`:
+
+```js
+const http = require('http');
+
+http.createServer( (request, response) => {
+  response.writeHead(200, {'Content-Type': 'text/plain'});
+  response.end('Hello World\n');
+}).listen(8124);
+
+console.log('Server running at http://127.0.0.1:8124/');
+```
+
+To run the server, put the code into a file called `example.js` and execute
+it with the node program
+
+```
+$ node example.js
+Server running at http://127.0.0.1:8124/
+```
+
+All of the examples in the documentation can be run similarly.
+
+[web server]: http.html