Adds README file

With informaton about usage, installation and build.

README.md

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+# stockuploader
+
+stockuploader allows you to upload images and video via command line to Adobe Stock. Simple and easy. While the stockuploader works, it is a very early version.
+
+## Usage
+
+```
+stockuploader
+
+        Usage:
+          stockuploader --username peter --password secret <file>...
+          stockuploader --username peter --password secret [--remote hostname] <file>...
+          stockuploader --username peter --password secret [--remote hostname] [--port 22] <file>...
+          stockuploader (-v | --version)
+
+          stockuploader (-h | --help)
+
+        Arguments:
+          <file>                One or multiple files you'd like to upload
+
+        Options:
+          -h --help                   Show this screen.
+          -v --version                Show version number.
+          -u --username=<username>    Provide your Adobe username.
+          -p --password=<password>    Provide your Adobe password.
+          -r --remote=<host>          sFTP remote host [default: sftp.contributor.adobestock.com].
+          -P --port=<port>            Remote port [default: 22].
+```
+
+## Installation
+
+If you are on a Mac and you are using homebrew, then you can install stockuploader via my tap.
+
+`$ brew tap brejoc/tap`  
+`$ brew install stockuploader`
+
+## Building
+
+Install the most recent version of Go. Currently this is version `1.21.1`. Since all of the dependencies are vendorized, a `go build` is enough. After that you'll see a `stockuploader` binary in the project folder.