Add README.md with project description and usage instructions

README.md

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+# RSA Generator in Rust
+
+RSA Generator written in Rust for TPSIT
+
+## Libraries used
+
+```
+colog = "1.3.0" -> Better logging
+log = "0.4.22" -> Base logging library
+num-bigint = { version = "0.4.6", features = ["rand"] } -> BigInt type + BigInt Random Generator
+num-traits = "0.2.19" -> Used for conversions
+num-primes = "0.3" -> Library used for generating prime numbers
+rand = "0.8" -> Random base library
+```
+
+## Usage
+1. Clone repo
+2. Either use `cargo run` or `cargo build`
+3. Run the code
+4. Cheers!