updating gitignores, adding example

.gitignore

@@ -1 +1,2 @@
 /target
+Cargo.lock

examples/particles/.gitignore

@@ -0,0 +1,2 @@
+/target
+Cargo.lock

examples/particles/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "particles"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+hypoloop = "0.1.1"

examples/particles/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    hypoloop::run_simulation();
+}