add perl support,

fx up func.pl

Signed-off-by: Minghe Huang <h.minghe@gmail.com>

examples/functions/Perl/README.md

@@ -0,0 +1,36 @@
+# Make a Perl function a service with fx
+
+Write a function like,
+
+```perl
+sub fx {
+  my $ctx = shift;
+  return 'hello fx'
+}
+
+1;
+```
+
+then deploy it with `fx up` command,
+
+```shell
+$ fx up -p 8080:3000 func.pl
+```
+
+test it using `curl`
+
+```shell
+$ curl 127.0.0.1:8080
+
+HTTP/1.1 200 OK
+Connection: keep-alive
+Content-Length: 11
+Content-Type: text/plain; charset=utf-8
+Date: Tue, 06 Aug 2019 15:58:41 GMT
+
+hello fx
+```
+
+### ctx
+
+The `ctx` object is exactly the [Controller](https://mojolicious.org/perldoc/Mojolicious/Controller) of [Mojolicious](https://mojolicious.org/perldoc/Mojolicious) framework.

examples/functions/Perl/func.pl

@@ -0,0 +1,6 @@
+sub fx {
+  my $ctx = shift;
+  return 'hello fx'
+}
+
+1;