chore: add MSRV

Author: ALVAROPING1

.github/workflows/test.yml

@@ -34,3 +34,15 @@ jobs:
         run: cargo test --all-features
         env:
             RUSTDOCFLAGS: --cfg docsrs
+  msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install MSRV
+        uses: dtolnay/rust-toolchain@master
+        with:
+            toolchain: "1.89"
+            components: rustfmt, clippy
+      - name: Check MSRV compatibility
+        run: cargo check --all-features

Cargo.toml

@@ -6,6 +6,7 @@ license = "LGPL-2.1-or-later"
 description = "A reimplementation of Creator (https://creatorsim.github.io/)'s compiler"
 categories = ["command-line-utilities", "compilers"]
 keywords = ["compiler", "assembly", "assembler", "Creator"]
+rust-version = "1.89"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html