initial doco for the item/store api call

doc/api_item_store.md

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+API item/store
+==============
+
+
+Description: item/store posts an item (typically a conversation item or post, but can be any item). 
+
+
+Required:
+
+- body
+
+	text/bbcode contents by default.
+
+
+Optional:
+
+- $_FILES['media']
+	uploaded media file (currently photos)
+
+- title
+	title of post/item
+
+- coord
+	geographic coordinates
+
+- location
+	freefrom location
+
+- expire
+	datetime this post will expire or be removed
+
+- mimetype
+	mimetype if not text/bbcode
+
+- parent
+	item.id of parent to this post (makes it a comment)
+
+- parent_mid
+	alternate form of parent using message_id
+
+- remote_xchan
+	xchan.xchan_hash of this message author if not the channel owner
+
+- consensus
+	boolean set to true if this is a consensus or voting item (default false)
+
+- nocomment
+	boolean set to true if comments are to be disabled (default false)
+
+- origin
+	do not use this without reading the code
+
+- namespace
+	persistent identity for a remote network or service
+
+- remote_id
+	message_id of this resource on a remote network or service
+
+- message_id
+	message_id of this item (leave unset to generate one)
+
+- created
+	datetime of message creation
+
+- post_id
+	existing item.id if this is an edit operation
+
+- app
+	application or network name to display with item
+
+- categories
+	comma separated categories for this item
+
+- webpage
+	item.page_type if not 0
+
+- pagetitle
+	for webpage and design elements, the 'page name'
+
+- layout_mid
+	item.mid of layout for this design element
+
+- plink
+	permalink for this item if different than the default
+
+- verb
+	activitystream verb for this item/activity
+
+- obj_type
+	activitystream object type for this item/activity
+