Read files macro for loading reading files to string at compile-time

Makefile for formatting and linting

Workspace for subcrates.

Moved crates to subdir and moved subcrate configs to workspace.*

crates/read_files/tests/lib.rs

@@ -0,0 +1,13 @@
+use read_files::read_files_to_string;
+
+#[test]
+fn test_load_files() {
+    let files = read_files_to_string!("./src", ".rs$");
+    assert!(!files.is_empty());
+}
+
+#[test]
+fn test_load_all_files() {
+    let files = read_files_to_string!("./src");
+    assert!(!files.is_empty());
+}