Adopt server examples

examples/README.md

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+# MCP SDK Examples
+
+This directory contains various examples of how to use the PHP MCP SDK.
+
+You can run examples 01-08 already with the dependencies installed in the root directory of the SDK, for example 09 see
+README in the `examples/09-standalone-cli` directory.
+
+For running an example, you execute the `server.php` like this:
+```bash
+php examples/01-discovery-stdio-calculator/server.php
+```
+
+You will see debug outputs to help you understand what is happening.
+
+Run with Inspector:
+
+```bash
+npx @modelcontextprotocol/inspector php examples/01-discovery-stdio-calculator/server.php
+```
+
+## Debugging
+
+You can enable debug output by setting the `DEBUG` environment variable to `1`, and additionally log to a file by
+setting the `FILE_LOG` environment variable to `1` as well. A `dev.log` file gets written within the example's
+directory.
+
+With the Inspector you can set the environment variables like this:
+```bash
+npx @modelcontextprotocol/inspector -e DEBUG=1 -e FILE_LOG=1 php examples/01-discovery-stdio-calculator/server.php
+```