Added some documentation

Author: Aversefun

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "[toml]": {
+        "editor.formatOnSave": false
+        // ^^ because of src/template/rust-toolchain.toml and the toml formatter not playing well with the weird template things I added
+    }
+}

src/crates_README.md

@@ -8,3 +8,5 @@ replace-with = 'local-registry'
 [source.local-registry]
 local-registry = '{?TOOLCHAIN.CRATES_DIR}' # double-check this path is correct, especially if you are creating the package on a different machine than the machine you are creating the package for
 ```
+
+(psst- if you know how to install crate files to the registry manually, make an issue or PR on [rust-pkg-gen](https://github.com/AverseABFun/rust-pkg-gen)!)

src/template/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 edition = "{?TOOLCHAIN.EDITION}"
 
 [dependencies]
-{?CRATES}
+{?CRATES}

src/template/build.sh

@@ -1,12 +1,12 @@
 #!/usr/bin/env bash
-CI=1
-cd "$(dirname "$0")"
+# shellcheck shell=bash
+cd "$(dirname "$0")" || exit
 cargo generate-lockfile --verbose
-"$CARGO_BIN_FILE_CARGO_LOCAL_REGISTRY" local-registry --sync Cargo.lock crates > /dev/null 2>&1
-    # ^^^ is super jank, but it expects that the first argument is the provided subcommand of cargo.
+"$CARGO_BIN_FILE_CARGO_LOCAL_REGISTRY" local-registry --sync Cargo.lock crates >/dev/null 2>&1
+# ^^^ is super jank, but it expects that the first argument is local-registry and acts strangely otherwise
 
 mv crates/* .
 if [[ "$1" != "save" ]]; then
     rm Cargo.lock Cargo.toml rust-toolchain.toml src/main.rs .cargo/config.toml build.sh
     rm -d src .cargo crates
-fi
+fi

src/template/rust-toolchain.toml

@@ -1,4 +1,4 @@
-[toolchain]
+[toolchain] # to be honest, probably only targets is required(can someone confirm?), but i'm not taking chances
 channel = "{?TOOLCHAIN.CHANNEL}"
 components = [ {?TOOLCHAIN.COMPONENTS} ]
 targets = [ {?TOOLCHAIN.TARGETS} ]