Added readme

Pzl.Ext.PDFExport/README.md

@@ -1,13 +1,26 @@
-## pzl-ext-pdf-export
+# Save and export as PDF by Puzzlepart
 
-This is where you include your WebPart documentation.
+A global list customizer which adds functionality to all document libraries in SharePoint Online to convert one or more documents in-place to PDF, or download one or more documents as a PDF. When selecting multiple documents for download they will be downloaded as a zip file.
+
+![Screenshot](./screenshot.png "Screenshot")
+
+## Installing the solution
+
+- Upload and Deploy the file [pzl-ext-highlight-home.sppkg](./pzl-ext-pdf-export.sppkg) to your tenant app catalog. ![TrustSolution](./screenshot-2.png "Trust solution")
+    * If created the tenant app catalog can be reached via `https://<tenant>-admin.sharepoint.com/_layouts/15/online/ManageAppCatalog.aspx`.
+    * You need to be a SharePoint Administrator to upload this solution.
+- Navigate to a document library and select one or more files and you should see the PDF options in the document ribbon.
+
+_Note: It may take a little while before it shows the first time after install._
 
 ### Building the code
 
+Ensure that at least SPFx v1.6 is installed.
+
 ```bash
-git clone the repo
+git clone https://github.com/Puzzlepart/spfx-solutions.git
+cd spfx-solutions/Pzl.Ext.PDFExport
 npm i
-npm i -g gulp
 gulp
 ```
 
@@ -16,11 +29,3 @@ This package produces the following:
 * lib/* - intermediate-stage commonjs build artifacts
 * dist/* - the bundled script, along with other resources
 * deploy/* - all resources which should be uploaded to a CDN.
-
-### Build options
-
-gulp clean - TODO
-gulp test - TODO
-gulp serve - TODO
-gulp bundle - TODO
-gulp package-solution - TODO