Create README.md

scripts/README.md

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+_Work in progress. Things may and probably will break for the foreseeable future. Do not rely on this for anything._
+
+## Connecting to Testnet
+
+To connect to a short-lived testnet we may or may not have running at the moment, use the `connect_to_testnet` script like so:
+
+```bash
+scripts/connect_to_testnet.sh testnet0
+```
+
+## Running your own testnet
+
+The `beacon_node` binary has a `createTestnet` command.
+
+```bash
+  nim c -r beacon_chain/beacon_node \
+    --network=$NETWORK_NAME \
+    --dataDir=$DATA_DIR/node-0 \
+    createTestnet \
+    --networkId=$NETWORK_ID \
+    --validatorsDir=$NETWORK_DIR \
+    --numValidators=$VALIDATOR_COUNT \
+    --firstUserValidator=$FIRST_USER_VALIDATOR \
+    --outputGenesis=$NETWORK_DIR/genesis.json \
+    --outputNetwork=$NETWORK_DIR/$NETWORK_FLAVOUR-network.json \
+    --bootstrapAddress=$PUBLIC_IP \
+    --genesisOffset=600 # Delay in seconds
+```
+
+Replace ENV vars with values that make sense to you.
+
+Full tutorial coming soon.