Reorganize contributing guidelines

Moved contributing guidelines from README.md to a new CONTRIBUTING.md file for better maintainability and clarity. Updated instructions include steps for generating and publishing proto files.

CONTRIBUTING.md

@@ -0,0 +1,27 @@
+# Contributing
+
+Report any protocol-specific issues in their
+[respective repositories](https://github.com/streamingfast/streamingfast#protocols)
+
+**Please first refer to the general
+[StreamingFast contribution guide](https://github.com/streamingfast/streamingfast/blob/master/CONTRIBUTING.md)**,
+if you wish to contribute to this code base.
+
+This codebase uses unit tests extensively, please write and run tests.
+
+## Generate pb files from proto definition
+```bash
+cd proto
+buf generate
+```
+
+## Publish proto definition and add it to `firecore` well known
+```bash
+cd proto
+buf push
+```
+### Once push go to `firecore` code and edit generator.go to add an entry to wellKnownProtoRepos list.
+From root of `firecore` project run  ...
+```bash
+go generate ./...
+```

README.md

@@ -23,13 +23,4 @@ The below command with start streaming Firehose Vara blocks, check `proto/sg/gea
 firevara fetch {FIRST_STREAMABLE_BLOCK} --endpoints {VARA_RPC_ENDPOINT} --state-dir {STATE_DIR}
 ```
 
-## Contributing
 
-Report any protocol-specific issues in their
-[respective repositories](https://github.com/streamingfast/streamingfast#protocols)
-
-**Please first refer to the general
-[StreamingFast contribution guide](https://github.com/streamingfast/streamingfast/blob/master/CONTRIBUTING.md)**,
-if you wish to contribute to this code base.
-
-This codebase uses unit tests extensively, please write and run tests.