added debug_launch_args example. #10

examples/debug_launch_args/Cargo.toml

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+[package]
+name = "debug_launch_args"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

examples/debug_launch_args/README.md

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+
+## How to configure debug launch arguments
+
+Visual Studio's Open Folder mode allows configuring the
+arguments for a debugger launch using a `launch.vs.json`
+file.  This file can be placed in the `.vs` directory,
+or, as in this example, as a sibling to `Cargo.toml`.
+
+```
+{
+  "version": "0.2.1",
+  "defaults": {
+  },
+  "configurations": [
+    {
+      "type": "default",
+      "name": "Bin: debug_launch_args/debug_launch_args",
+      "project": "Cargo.toml",
+      "projectTarget": "debug_launch_args/debug_launch_args",
+      "args": 
+      [ 
+          "--flag",
+          "value"
+      ]
+    }
+  ]
+}
+```
+
+- `type` must be "default"
+- `projectTarget` is the name of the package and the name of the target, separated by a slash
+- `project` must be "Cargo.toml"
+- `name` must be the same as projectTarget, except with "Bin: " or "Example: ", to indicate what kind of target.  Note the space after the colon.
+- `args` is a json array of strings, which will be the arguments passed to the executable being debugged
+

examples/debug_launch_args/launch.vs.json

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+{
+  "version": "0.2.1",
+  "defaults": {
+  },
+  "configurations": [
+    {
+      "type": "default",
+      "name": "Bin: debug_launch_args/debug_launch_args",
+      "project": "Cargo.toml",
+      "projectTarget": "debug_launch_args/debug_launch_args",
+      "args": 
+      [ 
+          "--flag",
+          "value"
+      ]
+    }
+  ]
+}

examples/debug_launch_args/src/main.rs

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+use std::env;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    dbg!(args);
+}