Initialize pgx demo project

.cargo/config

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+[build]
+# Postgres symbols won't be available until runtime
+rustflags = ["-C", "link-args=-Wl,-undefined,dynamic_lookup"]

.gitignore

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+.DS_Store
+.idea/
+/target
+*.iml
+**/*.rs.bk
+Cargo.lock

Cargo.toml

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+[package]
+name = "pgx_demo"
+version = "0.0.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[features]
+default = ["pg13"]
+pg10 = ["pgx/pg10", "pgx-tests/pg10" ]
+pg11 = ["pgx/pg11", "pgx-tests/pg11" ]
+pg12 = ["pgx/pg12", "pgx-tests/pg12" ]
+pg13 = ["pgx/pg13", "pgx-tests/pg13" ]
+pg14 = ["pgx/pg14", "pgx-tests/pg14" ]
+pg_test = []
+
+[dependencies]
+pgx = "=0.4.5"
+
+[dev-dependencies]
+pgx-tests = "=0.4.5"
+
+[profile.dev]
+panic = "unwind"
+lto = "thin"
+
+[profile.release]
+panic = "unwind"
+opt-level = 3
+lto = "fat"
+codegen-units = 1

pgx_demo.control

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+comment = 'pgx_demo:  Created by pgx'
+default_version = '@CARGO_VERSION@'
+module_pathname = '$libdir/pgx_demo'
+relocatable = false
+superuser = false

src/lib.rs

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+use pgx::*;
+
+pg_module_magic!();
+
+#[pg_extern]
+fn hello_pgx_demo() -> &'static str {
+    "Hello, pgx_demo"
+}
+
+#[cfg(any(test, feature = "pg_test"))]
+#[pg_schema]
+mod tests {
+    use pgx::*;
+
+    #[pg_test]
+    fn test_hello_pgx_demo() {
+        assert_eq!("Hello, pgx_demo", crate::hello_pgx_demo());
+    }
+
+}
+
+#[cfg(test)]
+pub mod pg_test {
+    pub fn setup(_options: Vec<&str>) {
+        // perform one-off initialization when the pg_test framework starts
+    }
+
+    pub fn postgresql_conf_options() -> Vec<&'static str> {
+        // return any postgresql.conf settings that are required for your tests
+        vec![]
+    }
+}