fix: Add NEAR Runtime utils README to be able to publish (#3280)

Missing README for a crate to publish Going to publish runtime crates at `2.2.0`. ## Test plan: - publish with dry-run
near · Sep 7, 2020 · b35bf58 · b35bf58
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diff --git a/runtime/near-runtime-utils/Cargo.toml b/runtime/near-runtime-utils/Cargo.toml
@@ -13,4 +13,7 @@ This crate contains utility functions for NEAR runtime.
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+# The crate should't include dependencies on `near-primitives` and `near-crypto` to keep the dependencies limited.
+# Historically, `near-primitives` contained a bunch of dependencies that prevented this crate from being compiled to Wasm.
+
 [dependencies]
diff --git a/runtime/near-runtime-utils/README.md b/runtime/near-runtime-utils/README.md
@@ -0,0 +1,6 @@
+# NEAR Runtime utilities
+
+This crate contains utility functions for NEAR runtime.
+
+The crate doesn't include dependencies on `near-primitives` and `near-crypto` to keep the dependencies limited.
+Historically, `near-primitives` contained a bunch of dependencies that prevented this crate from being compiled to Wasm.