Add development notes to readme

Author: szapp

.gitignore

@@ -1,3 +1,4 @@
 /node_modules/
 /coverage/
 /src/generated/
+/_work/

README.md

@@ -144,3 +144,16 @@ jobs:
 
 > [!Note]
 > This procedure only works reasonably well if `patch-validator` is only called once in the workflow file.
+
+## Development
+
+This project uses automatic linting, formatting, and tests.
+
+Before setting up the dependencies with `npm ci`, an installation of Java is required for `antlr4ng-cli`.  
+The correct versions are best installed with [`antlr4-tools`](https://github.com/antlr/antlr4-tools).
+In brief, run the following commands within a Python 3 installation/environment.
+
+```bash
+pip install antlr4-tools
+antlr4
+```

tsconfig.json

@@ -15,5 +15,5 @@
     "skipLibCheck": true,
     "newLine": "lf"
   },
-  "exclude": ["./dist", "./node_modules", "./__tests__", "./coverage"]
+  "exclude": ["./dist", "./node_modules", "./__tests__", "./coverage", "./_work"]
 }