docs: streamable server sample (#595)

- add a simple streamable http server example with auth
- update readme: replace quickstart example from sse server to
streamable server
- add readme files for samples, simple-streamable-server, notebooks

closes #170 

## How Has This Been Tested?
knit and inspector

## Breaking Changes
NaN

## Types of changes
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [x] Documentation update

## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [x] I have added or updated documentation as needed

samples/simple-streamable-server/build.gradle.kts

@@ -0,0 +1,29 @@
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.shadow)
+    application
+}
+
+group = "org.example"
+version = "0.1.0"
+
+application {
+    mainClass.set("io.modelcontextprotocol.sample.server.MainKt")
+}
+
+dependencies {
+    implementation(dependencies.platform(libs.ktor.bom))
+    implementation(libs.mcp.kotlin.server)
+    implementation(libs.ktor.server.netty)
+    implementation(libs.ktor.server.auth)
+    implementation(libs.ktor.server.cors)
+    implementation(libs.ktor.server.content.negotiation)
+    implementation(libs.ktor.server.sse)
+    implementation(libs.ktor.serialization.kotlinx.json)
+    implementation(libs.slf4j.simple)
+}
+
+kotlin {
+    jvmToolchain(17)
+}