README: Add progress

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

README.md

@@ -7,3 +7,39 @@ Parser for the [Scansion project][Scansion] DSL.
 # License
 
 SPDX: MPL-2.0. See LICENSE file.
+
+# Parsing support
+
+Language features are more or less defined here:  
+https://matthewwild.co.uk/projects/scansion/usage/script-basics/
+
+This library supports parsing the following:
+
+- [ ] Metadata
+- [x] Client
+	* [x] Attributes  
+		Following lines beginning with at least a tab (`\t`) character, in the
+		form `attr: value`, and ending with a newline (`\n`). Any line that
+		matches this format will be parsed and will be discarded if it doesn't
+		match an actual client attribute.
+		- [x] jid: Expects a bare jid or a full jid. Will be converted to
+			  `jid::Jid`.
+		- [x] password
+		- [x] custom\_host
+		- [x] custom\_port: Expect a u16
+- [-] Actions
+	* [x] 'connects'
+	* [x] 'disconnects'
+	* [-] 'sends:' / 'receives:'
+		- [x] A block of lines each starting with a tab (`\t`) after the
+			  action will be converted to a `minidom::Element`.
+		- [ ] `nothing` as the absence of stanza.
+- [x] Comments  
+	Optional lines starting with a `#` or `//` and ending with a newline
+	(`\n`). They get discarded in the output
+
+## minidom::Element
+
+Minidom `Element`s require every element to be namespaced. This parser adds
+`jabber:client` as a default namespace. It also adds a `scansion` namespace
+that is used for the `scansion:strict` XML parameter.