Added new directory for translated README files.

translations/how-to.md

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+Please put new translation README files here.
+
+I'll migrate the existing translations when they are ready.
+
+To start a new translation, please:
+
+1. Make an issue (for collaboration with other translators)
+2. Make a pull request to collaborate and commit to.
+3. Let me know when it's ready to pull.
+
+Thank you!