update README.md

README.md

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 # ArcHIVE
 
 A lightweight in-memory database written in Rust
+
+## Usage
+
+### CLI
+
+Download a binary or compile it yourself using `cargo build --release --bin archive-cli`
+To compile the CLI and install it globally run `cargo install --path .`
+
+### Server
+
+#### Docker
+
+The repository contains a simple `compose.yaml`
+
+#### Binary
+
+Alternatively you can run the server binary directly
+Download a binary or compile it yourself using `cargo build --release --bin archive-server`
+
+#### Environment variables
+
+This is a list of the server's environment variables and their default values:
+
+- SERVER_HOST=0.0.0.0
+- SERVER_PORT=6171
+- MAX_CONNECTIONS=256
+- LOG_LEVEL=info