[Docs] Added section in README on how to add a new chain to SOR (#119)

README.md

@@ -145,3 +145,17 @@ Calldata: 0x414bf389000000000000000000000000dac17f958d2ee523a2206206994597c13d83
 ```
 ./bin/cli quote --tokenIn 0x2791bca1f2de4661ed88a30c99a7a9449aa84174 --tokenOut 0x7ceb23fd6bc0add59e62ac25578270cff1b9f619 --amount 5 --exactIn --minSplits 1 --protocols v3 --router alpha --chainId 137
 ```
+
+## Adding a new Chain
+The main components to complete are:
+* Deploy contracts on chain, add the pools to subgraph
+* Populate v3 providers in `src/providers/v3/subgraph-provider` and `src/providers/v3/static-subgraph-provider`
+* Populate chainId and addresses in `src/util/chains.ts` and `src/util/addresses.ts`
+* Populate token providers in `src/providers/caching-token-provider` and `src/providers/token-provider.ts`
+* Populate gas constants in `src/routers/alpha-router/gas-models/*`
+* Populate bases in `src/routers/legacy-router/bases.ts`
+* Populate `test/integ/routers/alpha-router/alpha-router.integration.test.ts` and `src/providers/v2/static-subgraph-provider.ts`
+* Populate `src/routers/alpha-router/*`
+* Add a log to `/CHANGELOG.md`
+* Run `npm run integ-test` successfully
+