chore: add sample env/config templates for example modules

Author: however-yir

conformance-tests/.env.example

@@ -0,0 +1,5 @@
+# Copy values into your shell before running the conformance example clients.
+MCP_CONFORMANCE_SCENARIO=initialize
+
+# Used by auth/pre-registration scenarios in the Spring client.
+MCP_CONFORMANCE_CONTEXT={"client_id":"REPLACE_ME","client_secret":"REPLACE_ME"}

conformance-tests/client-jdk-http-client/README.md

@@ -13,6 +13,8 @@ The client reads test scenarios from environment variables and accepts the serve
 - **MCP_CONFORMANCE_SCENARIO**: Environment variable specifying which test scenario to run
 - **Server URL**: Passed as the last command-line argument
 
+For a quick starting point, see [`../.env.example`](../.env.example) and export the variables you need before launching the client.
+
 ## Supported Scenarios
 
 Currently implemented scenarios:

conformance-tests/client-spring-http-client/README.md

@@ -43,6 +43,8 @@ The client is a Spring Boot application that reads test scenarios from environme
 - **MCP_CONFORMANCE_CONTEXT**: Environment variable with JSON context (used by `auth/pre-registration`)
 - **Server URL**: Passed as the last command-line argument
 
+For a quick starting point, see [`../.env.example`](../.env.example) and export the variables you need before launching the client.
+
 ### Scenario Routing
 
 The application uses Spring's conditional configuration to select the appropriate scenario at startup: