Update README.md with build and run instructions

README.md

@@ -10,6 +10,61 @@ your own risk.**
 
 An application that uses AshMaize PoW algorithm to scavenge for night.
 
+# Building from source with 'cargo', if you don't have nix
+
+
+```bash
+cargo build --release
+```
+
+If you encounter issue with the build try to run `cargo  fix --bin "shadow-harvester"`
+
+Run
+
+```bash
+cargo run --release -- <args>
+```
+OR 
+
+
+```bash
+./target/release/shadow-harvester <args>
+```
+
+# Usage
+The below commands will use `nix` for running the command, if you don't use nix you can use `cargo` or just build `./target/release/shadow-harvester <args>`
+
+
+## Running with a Mnemonic File
+
+To run Shadow Harvester with a mnemonic file:
+
+```bash
+nix run .\#shadow-harvester -- --api-url https://scavenger.prod.gd.midnighttge.io --accept-tos --mnemonic-file wallet.mnemonic
+```
+
+## Creating a Wallet
+
+If you haven't created a wallet yet, you can generate a recovery phrase using `cardano-address`:
+
+```bash
+cardano-address recovery-phrase generate > wallet.mnemonic
+```
+
+**Security Note:** There is always a security risk when using plain text mnemonics. For  Midnight, it is recommended that you transfer your NIGHT tokens to your preferred secure wallets after the glacier drop period concludes.
+
+## Running with a Single Payment Key
+
+If you just want to mine with a single key:
+
+```bash
+nix run .\#shadow-harvester -- --api-url https://scavenger.prod.gd.midnighttge.io --accept-tos --payment-key "YOURED25519PRIVATEKEY"
+```
+
+**Note on Ephemeral Keys**
+
+Ephemeral keys are not recommended for use. Currently, the donate-to endpoint is not active, which means any keys generated ephemerally are discarded and never persisted to disk. While this approach was initially considered, the implementation was switched to mnemonic-based keys due to the non-functional donate-to endpoint. Use mnemonic files or payment keys instead until the donate-to functionality becomes available.
+
 # License
 
 This project is licensed under either of the following licenses: