Updated readme with Zeke & Tarik comments

- Added the memory requirements for sidecar.
- Added the specs needed if running also a node alongside sidecar.
- Added the benchmarks results from Tarik.

README.md

@@ -389,4 +389,34 @@ NOTE: You must be a member of the `@substrate` NPM org and must belong to the `D
 
 ## Hardware requirements
 
-Sidecar is a stateless program and thus has no specific hardware requirements to run (disk space, memory, etc.).
+### Disk Space
+Sidecar is a stateless program and thus should not use any disk space.
+
+### Memory
+Memory wise the requirements follow the default of node.js processes which is an upper bound in HEAP memory of a little less than 2GB thus 4GB of memory should be sufficient.
+
+### Running sidecar and a node
+Please note that if you run sidecar next to a substrate node in a single machine then your system specifications should improve significantly. 
+- Our official specifications related to validator nodes can be found in the polkadot wiki [page](https://wiki.polkadot.network/docs/maintain-guides-how-to-validate-polkadot#standard-hardware).
+- Regarding archive nodes :
+  - again as mentioned in the polkadot wiki [page](https://wiki.polkadot.network/docs/maintain-sync#types-of-nodes), the space needed from an archive node depends on which block we are currently on (of the specific chain we are referring to).
+  - there are no other hardware requirements for an archive node since it is not time critical (archive nodes do not participate in the consensus).
+
+### Benchmarks
+During the benchmarks we performed, we concluded that sidecar would use a max of 1.1GB of RSS memory. 
+
+The benchmarks were:
+- using 4 threads over 12 open http connections and
+- were overloading the cache with every runtime possible on polkadot. 
+
+Hardware specs in which the benchmarks were performed:
+```
+Machine type:
+n2-standard-4 (4 vCPUs, 16 GB memory)
+
+CPU Platform:
+Intel Cascade Lake
+
+Hard-Disk:
+500GB
+```