initial structure + nix build (#1)

(incl. cross-compiling)

README.md

@@ -1,2 +1,36 @@
-# timr
-tim:r
+# tim:r
+
+## Development
+
+### Requirements
+
+#### Nix (recommend)
+
+`cd` into root directory.
+
+If `direnv` is installed, run `direnv allow` once to install dependencies. Others run `nix develop`.
+
+
+#### Non Nix user
+
+- [`Rust`](https://www.rust-lang.org/)
+
+
+#### Build/run
+
+```sh
+cargo run
+```
+
+
+## Build release
+
+- Linux
+```sh
+nix build
+```
+
+- Windows (cross-compilation)
+```sh
+nix build .#windows
+```