add readme

README.md

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 # ftp-action
+
+Automate copying your files via FTP using this GitHub action.
+
+## Example usage
+
+```
+name: Upload via FTP
+on: push
+jobs:
+  FTP-Action:
+    name: FTP-Action
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Deploy FTP
+      uses: sebastianpopp/ftp-action@master
+      with:
+        host: "ftp.example.com"
+        user: ${{ secrets.FTP_USERNAME }}
+        password: ${{ secrets.FTP_PASSWORD }}
+        localDir: "dist"
+        remoteDir: "www"
+```
+
+## Input parameters
+
+Input parameter | Description | Required | Default
+--- | --- | --- | ---
+host | FTP server name | Yes | N/A
+user | FTP username | Yes | N/A
+password | FTP password | Yes | N/A
+localDir | The local directory to copy | No | .
+remoteDir | The remote directory to copy to | No | .