grpcurl: add page (#4198)

Co-authored-by: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>

pages/common/grpcurl.md

@@ -0,0 +1,20 @@
+# grpcurl
+
+> Like cURL, but for gRPC: CLI tool for interacting with gRPC servers.
+> More information: <https://github.com/fullstorydev/grpcurl>.
+
+- Send an empty request:
+
+`grpcurl {{grpc.server.com:443}} {{my.custom.server.Service/Method}}`
+
+- Send a request with a header and a body:
+
+`grpcurl -H "{{Authorization: Bearer $token}}" -d {{'{"foo": "bar"}'}} {{grpc.server.com:443}} {{my.custom.server.Service/Method}}`
+
+- List all services exposed by a server:
+
+`grpcurl {{grpc.server.com:443}} list`
+
+- List all methods in a particular service:
+
+`grpcurl {{grpc.server.com:443}} list {{my.custom.server.Service}}`