Add template for rust library crate

templates/rust/crate-lib/.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

templates/rust/crate-lib/.envrc

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+use flake

templates/rust/crate-lib/.gitignore

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+/target
+.envrc

templates/rust/crate-lib/flake.nix

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+{
+    description = "@project_description@";
+
+    inputs = {
+        nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+        rust-overlay ={
+            url = "github:oxalica/rust-overlay";
+            inputs.nixpkgs.follows = "nixpkgs";
+        };
+    };
+
+    outputs = { nixpkgs, rust-overlay, ... }:
+    let
+        system = "x86_64-linux";
+
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+            inherit system overlays;
+        };
+
+        rust = pkgs.rust-bin;
+
+        rustToolchain = rust.fromRustupToolchainFile ./rust-toolchain.toml;
+        rustNightlyToolchain = rust.selectLatestNightlyWith(tc: tc.minimal.override {
+            extensions = [ "rustfmt" ];
+            targets = [ "x86_64-unknown-linux-gnu" ];
+        }) ;
+
+        buildTools = [
+            rustToolchain
+            rustNightlyToolchain
+        ];
+
+        devShell = pkgs.mkShell {
+            name = "@project_name@";
+            buildInputs = buildTools;
+            packages = with pkgs; [
+                rust-analyzer
+            ];
+        };
+    in {
+        devShells.${system}.default = devShell;
+    };
+}

templates/rust/crate-lib/rust-toolchain.toml

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+[toolchain]
+channel = "stable"
+components = ["clippy", "rust-analyzer", "rust-src"]
+targets = ["x86_64-unknown-linux-gnu"]
+profile = "minimal" # includes rustc, cargo, and rust-std

templates/rust/crate-lib/rustfmt.toml

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+edition = "2021"
+
+# Just enforce it here as well instead of relying on editorconfig alone
+hard_tabs = false
+tab_spaces = 4
+newline_style = "Unix"
+
+imports_granularity = "Module"
+group_imports = "StdExternalCrate"
+
+force_multiline_blocks = false
+fn_single_line = false
+comment_width = 100
+wrap_comments = true
+hex_literal_case = "Upper"
+blank_lines_upper_bound = 2
+overflow_delimited_expr = true
+reorder_impl_items = true