sketched out initial version of language

README.md

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+# kdl - Kat's Document Language
+
+kdl is a document language, mostly based on [SDLang](https://sdlang.org), with
+xml-like semantics that looks like you're invoking a bunch of CLI commands!
+
+It's meant to be used both as a serialization format and a configuration
+language, and is relatively light on syntax compared to XML.
+
+## Intro
+
+Most of the syntax is basically the same as SDLang:
+
+```kdl
+// This is a node with a single string value
+title "Hello, World"
+
+// Multiple values are supported, too
+bookmarks 12 15 188 1234
+
+// Nodes can have attributes
+author "Alex Monad" email="alex@example.com" active=true
+
+// Nodes can be arbitrarily nested
+contents {
+	section "First section" {
+		paragraph "This is the first paragraph"
+		paragraph "This is the second paragraph"
+	}
+}
+```
+
+But kdl changes a few details:
+
+```kdl
+// Instead of anonymous nodes, nodes and properties can be wrapped
+// in "" for arbitrary node names.
+"!@#$@$%Q#$%~@!40" "1.2.3" "!!!!!"=true
+
+// The following is a legal bare identifier:
+foo123~!@#$%^&*.:'|<> "weeee"
+
+// kdl specifically allows properties and values to be
+// interspersed with each other, much like CLI commands.
+foo bar=true "baz" quux=false 1 2 3
+
+// strings can be multiline as-is, without a different syntax.
+string "my
+multiline
+value"
+
+// raw/unescaped strings use the "r" prefix on string literals and
+// otherwise behave the same, including multiline support.
+raw r"C:\Users\kdl"
+
+// You can add any number of # after the r and the last " to
+// disambiguate literal " characters.
+other-raw r#"hello"world"#
+
+// There is a single decimal number type, much like JSON's.
+num 1.234e-42
+
+// There is additional support for literal hexadecimal, octal, and binary input.
+my-hex 0xdeadbeef
+my-octal 0o755
+my-binary 0b10101101
+```
+
+## Design and Discussion
+
+kdl is still extremely new, and discussion about the format should happen over
+on the [discussions page](https://github.com/zkat/kdl/discussions). Feel free
+to jump in and give us your 2 cents!