readme: adds instructions for all languages.

Author: anthonydmays

c-sharp/README.md

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+# C# Workbench
+
+### Instructions
+
+1. Open a new terminal and navigate to this directory.
+```bash
+/workspaces/language-workbench (main) $ cd c-sharp
+/workspaces/language-workbench/c-sharp (main) $
+```
+2. Run the app using the `dotnet run` command.
+```bash
+/workspaces/language-workbench/c-sharp (main) $ dotnet run
+```

html-css-javascript/README.md

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+# Python Workbench
+
+### Instructions
+
+To run, open the `index.html` file using your favorite browser. If you're using VS Code, you can install the [Live Server][live-server-link] extension and open the file by right-clicking it and selecting `Open with Live Server`. This is pre-install in the Dev Container located in the parent repository.
+
+[live-server-link]: https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer

java/README.md

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+# Java Workbench
+
+### Instructions
+
+1. Open a new terminal and navigate to this directory.
+```bash
+/workspaces/language-workbench (main) $ cd java
+/workspaces/language-workbench/java (main) $
+```
+2. Execute `./gradlew run` to run the main application.
+```bash
+/workspaces/language-workbench/java (main) $ ./gradlew run
+```
+3. Execute `./gradlew test` to run the tests.
+```bash
+/workspaces/language-workbench/java (main) $ ./gradlew test
+```

python/README.md

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+# Python Workbench
+
+### Instructions
+
+1. Open a new terminal and navigate to this directory.
+```bash
+/workspaces/language-workbench (main) $ cd python
+/workspaces/language-workbench/python (main) $
+```
+2. Execute `python main.py` to run the main application.
+```bash
+/workspaces/language-workbench/python (main) $ python main.py
+```

typescript/README.md

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+# Typescript Workbench
+
+### Instructions
+
+1. Open a new terminal and navigate to this directory.
+```bash
+/workspaces/language-workbench (main) $ cd typescript
+/workspaces/language-workbench/typescript (main) $
+```
+2. Install node dependencies using `pnpm`.
+```bash
+/workspaces/language-workbench/typescript (main) $ pnpm install
+```
+3. Run the `dev` script.
+```bash
+/workspaces/language-workbench/typescript (main) $ pnpm run dev
+```
+4. When done, press `Ctrl-C` in the terminal to exit.