Add "hello world" component sample (microsoft#2814)

.github/workflows/clippy.yml

@@ -37,6 +37,7 @@ jobs:
           cargo clippy -p riddle &&
           cargo clippy -p sample_bits &&
           cargo clippy -p sample_com_uri &&
+          cargo clippy -p sample_component_hello_world &&
           cargo clippy -p sample_consent &&
           cargo clippy -p sample_core_app &&
           cargo clippy -p sample_counter &&

.github/workflows/test.yml

@@ -44,6 +44,7 @@ jobs:
           cargo test -p riddle &&
           cargo test -p sample_bits &&
           cargo test -p sample_com_uri &&
+          cargo test -p sample_component_hello_world &&
           cargo test -p sample_consent &&
           cargo test -p sample_core_app &&
           cargo test -p sample_counter &&

Cargo.toml

@@ -4,6 +4,7 @@ members = [
     "crates/libs/*",
     "crates/samples/windows-sys/*",
     "crates/samples/windows/*",
+    "crates/samples/components/*",
     "crates/targets/*",
     "crates/tests/*",
     "crates/tools/*",

crates/samples/components/hello_world/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "sample_component_hello_world"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]

crates/samples/components/hello_world/readme.md

@@ -0,0 +1 @@
+Sample for [Creating your first DLL in Rust](https://kennykerr.ca/rust-getting-started/creating-your-first-dll.html) in [Getting Started with Rust](https://kennykerr.ca/rust-getting-started).

crates/samples/components/hello_world/src/lib.rs

@@ -0,0 +1,4 @@
+#[no_mangle]
+extern "system" fn HelloWorld() -> i32 {
+    123
+}