More flow docs

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

docs/mobile_flow.md

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+# Mobile flow
+
+To enable collabora editor into a client there are a few things that need to be 
+care off.
+
+## 1. Check for support
+
+Check the capabilities API
+
+`<server>/ocs/v2.php/cloud/capabilities`
+
+If this contains a richdocument section then mobile editing is supported.
+There is a list of mimetypes that can be edited with collabora supplied.
+
+## 2. Open a file with a fileid
+
+This happens via the OCS api described [here](./mobile_editor.md)
+This returns an URL that you have to open in a full screen webview.
+Be sure to have javascript enabled.
+
+## 3. Interacting with the document
+
+The richdocuments app looks for a javscript handler that the client can
+register. This is: `RichDocumentsMobileInterface`
+
+It expects the following functions:
+
+### close()
+
+This closed the webview.
+
+### insertGraphic()
+
+open a filepicker to select a file from your nextcloud.
+The file has to be submitted to the [asset api](./asset_api.md).
+
+Then the client has to call the function (on the webui):
+`OCA.RichDocuments.documentsMain.postAsset(filename, url)`
+
+This will make sure the assets is added to the document.
+
+### share()
+
+opens the share sidebar for the current file
+
+