Adding tests/README.md file

[divyagayathri-hcl]

Keyword check:
eonms6vm2@eonms6vm2:~/psj-sonic-pins/sonic-buildimage/src/sonic-p4rt/sonic-pins$ ~/key_check.sh .
Keyword check Passed.
Build Results:
INFO: Elapsed time: 3256.158s, Critical Path: 959.00s
INFO: 9345 processes: 2817 internal, 6528 linux-sandbox.
INFO: Build completed successfully, 9345 total actions
eonms6vm2@303c4c9222d0:/sonic/src/sonic-p4rt/sonic-pins$ bazel test $BAZEL_BUILD_OPTS --cache_test_results=no ...
DEBUG: Rule 'com_github_nelhage_rules_boost' indicated that a canonical reproducible form can be obtained by modifying arguments shallow_since = "1619053724 -0700"
DEBUG: Repository com_github_nelhage_rules_boost instantiated at:
/sonic/src/sonic-p4rt/sonic-pins/WORKSPACE.bazel:75:9: in
/var/eonms6vm2/.cache/bazel/_bazel_eonms6vm2/5fd88bad78ef03829a4685c83637a020/external/com_github_p4lang_p4c/bazel/p4c_deps.bzl:25:23: in p4c_deps
Repository rule git_repository defined at:
/var/eonms6vm2/.cache/bazel/_bazel_eonms6vm2/5fd88bad78ef03829a4685c83637a020/external/bazel_tools/tools/build_defs/repo/git.bzl:199:33: in
INFO: Analyzed 477 targets (1 packages loaded, 442 targets configured).
INFO: Found 314 targets and 163 test targets...
INFO: Elapsed time: 111.274s, Critical Path: 25.80s
INFO: 168 processes: 194 linux-sandbox, 18 local.
INFO: Build completed successfully, 168 total actions
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//sai_p4/instantiations/google/test_tools:table_entry_generator_test PASSED in 13.5s
Stats over 5 runs: max = 13.5s, min = 1.0s, avg = 5.7s, dev = 5.7s

Executed 163 out of 163 tests: 163 tests pass.
INFO: Build completed successfully, 168 total actions