Add README

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>

README.md

@@ -0,0 +1,39 @@
+# xdg-desktop-portal-tde
+
+## What is this?
+
+This is an implementation of the [FreeDesktop Portals API](https://flatpak.github.io/xdg-desktop-portal).
+
+THIS IS AN EARLY PROTOTYPE. USE WITH CARE.
+
+This implementation exposes TDE APIs to applications which use the Portals API. As a result, these applications
+can transparently use native APIs and dialogs.
+
+Read more about the portals API on its official [website](https://flatpak.github.io/xdg-desktop-portal/docs/introduction.html).
+
+## How do I use this?
+Before using this, make sure you have the `xdg-desktop-portal` package installed and running on your system.
+
+To make Firefox use the Portals API, go to `about:config`, search for options that start with "widget.use-xdg-desktop-portal" and,
+if they are set to 2, set them to 1.
+
+## State of implementation
+
+Currently implemented are the following interfaces:
+* FileChooser - request a file dialog
+
+The following implementations are planned (listed in no particular order):
+* Screenshot - request a screenshot
+* App Chooser - show a "Open with..." dialog for a file
+* Clipboard - request clipboard access (*)
+* Email - request to send an e-mail via the system e-mail client
+* OpenURI - request to open a URL
+* Secret - integration with TDEWallet
+* Account - request user information (username, full name, user icon)
+* Access - show a grant access dialog
+* Wallpaper - request to change the user's wallpaper
+* Print - request a file to be printed
+
+(*) Needs Session interface implementation
+
+Additionaly, it must be noted that the implementation does not currently support the Documents portal API (and therefore sandboxed applications).