Added README.md

Fortune for reverse's current commit: Future blessing − 末吉

README.md

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+# reverse
+Collects input, reverses it, then outputs it.
+
+## Usage
+From arguments:
+```shell
+$ reverse 1 2 3 4
+4
+3
+2
+1
+```
+
+From standard input:
+```shell
+$ find . | reverse
+```
+Standard input is read *line by line*, unlike arguments. The two cannot be combined.
+
+# Build
+Requires `rust` and `cargo` installed:
+```shell
+$ cargo build --release
+```
+
+The outputted binary will be `./target/release/reverse`.
+
+## Customise behaviour
+There are several compile-time flags.
+See [./Cargo.toml](Cargo.toml) for the description of each one.
+
+To build with custom features:
+```shell
+$ cargo build --release --no-default-features --features <your feature>,...
+```
+
+# License
+Public domain. 
+
+This is a toy project I used to play around with what I could do with slice patterns in Rust.