Update README.md [skip ci]

README.md

@@ -17,17 +17,27 @@ Ethereum-related utilities written in Nim. Includes things like Bloom filters, p
 - [trie](doc/trie.md)
 - [bloom](doc/bloom.md)
 
+## Prerequisites
+
+- Nim & Nimble
+- RocksDB, SQLite, LMDB (required for the trie backend tests)
+
 ## Building & Testing 
-
-### Prerequisites
-
-Nimble is installed.
-
 ```
+# Install required modules
 nimble install
+# Run full test suite
 nimble test
 ```
 
+You can also run specific parts of the test suite, e.g.:
+```
+# Test p2p functionality
+nimble test_p2p
+# Test rlp functionality
+nimble test_rlp
+```
+
 ## License
 
 Licensed and distributed under either of