New docs

docs/configuration/dcr.toml-overview.md

@@ -1,2 +1,45 @@
 # dcr.toml overview
 
+`dcr.toml` is the main project file used by DCR.
+
+## Minimal generated template
+
+```toml
+[package]
+name = "hello"
+version = "0.1.0"
+
+[build]
+language = "c"
+standard = "c11"
+compiler = "clang"
+kind = "bin"
+
+[dependencies]
+```
+
+`dcr new` and `dcr init` generate this structure automatically.
+
+## Required sections
+
+- `[package]`
+- `[build]`
+- `[dependencies]`
+
+## Required keys
+
+- `package.name`
+- `package.version`
+- `build.language`
+- `build.standard`
+- `build.compiler`
+- `build.kind`
+
+`build.kind` must be either `bin` or `staticlib`.
+
+## Optional keys
+
+- `build.target`
+- `build.cflags`
+- `build.ldflags`
+- dependency fields (`include`, `lib`, `libs`, `system`)