add missing docs for the paket-push docsfile

docs/content/paket-push.md

@@ -0,0 +1,20 @@
+# paket push
+
+Pushes the given `.nupkg` file.
+
+    [lang=msh]
+    paket push url <string> file <string> [apikey <string>] [endpoint <string>]
+
+### Options:
+
+  `url <string>`: Url of the NuGet feed.
+
+  `file <string>`: Path to the package.
+
+  `apikey <string>`: Optionally specify your API key on the command line. Otherwise uses the value of the `nugetkey` environment variable, or the api key stored in the [`paket.config` file](paket-config.html) for this url.
+
+  `endpoint <string>`: Optionally specify a custom api endpoint to push to. Defaults to `/api/v2/package`.
+
+If you add the `-v` flag, then Paket will run in verbose mode and show detailed information.
+
+With `--log-file [FileName]` you can trace the logged information into a file.