doc updates

Cargo.lock

@@ -1074,6 +1074,10 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "hello-world"
+version = "0.1.0"
+
 [[package]]
 name = "hermit-abi"
 version = "0.3.9"

Cargo.toml

@@ -24,7 +24,7 @@ members = [
   "members/onlytoken",
   "members/sqlite-demo",
   "members/diesel-demo",
-  "members/ptlog",
+  "members/ptlog", "members/hello-world",
 ]
 default-members = [
   ".",

README.md

@@ -1,11 +1,46 @@
 # Rust basics
 
 This project contains various smaller rust projects, often made by myself to
-gain more understanding with a topic or dependency.
+gain more understanding with a topic or dependency. It contains the absolute
+basics of the language, the more advanced topics, but also demos on various dependencies.
+
+**Basics**
+* [echargs](./members/echargs/)
+* [shortc](./members/shortc/)
+* [hello-world](./members/hello-world/)
+* [revsqrt](./members/revsqrt/)
+
+**Intermediate**
+* [mpsc](./members/mpsc/)
+* [mpsc-full](./members/mpsc-full/)
+* [panic-calm](./members/panic-calm/)
+* [socker](./members/socker/)
+
+**Dependencies**
+* [serde-json-demo](./members/serde-json-demo/)
+* [claptest](./members/claptest/)
+* [ptlog](./members/ptlog/)
+* [slog-demo](./members/slog-demo/)
+* [sqlite-demo](./members/sqlite-demo/)
+
+**Advanced Dependencies**
+* [diesel-demo](./members/diesel-demo/)
+* [tokio-send-sync](./members/tokio-send-sync/)
+* [tokryon](./members/tokryon/)
+* [cucumber-demo](./members/cucumber-demo/)
+* [criterion-demo](./members/criterion-demo/)
+* [rest](./members/rest/)
+* [rest-queued](./members/rest-queued/)
 
 ## Rust unsafe
 
 Unsafe rust offers many possibilities otherwise locked from rust, which might
 cause undefined behavior (or are dubbed unsafe for other reasons). Let's be
-honest, they are hacks. But they can have fun uses and are sometimes interesting
+honest, they are often hacks. But they can have fun uses and are sometimes
-to explore, if only to see how the underlying system works.
+interesting to explore, if only to see how the underlying system works.
+
+Unsafe rust also has important uses when using programs developed in other
+languages (like C or C++) or when manipulation of bits, bytes, and memory is
+in needed (sorting algorithms).
+
+See [rs-unsafe](rs-unsafe) for more.

members/hello-world/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "hello-world"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

members/hello-world/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}