Add test readme

test/README.md

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+# TPM tests
+
+- all testing is done with vagrant for complete isolation from
+  local development environment.
+- `expect` program is used for testing tmux client (keybindings and some output)
+
+#### Running tests
+
+Requirements: [vagrant](https://www.vagrantup.com/)
+
+Running test suite is easy:
+
+    # within `tpm` project directory
+
+    $ cd test           # enter test directory
+    $ ./run             # runs all the tests