prqlc: add page

prqlc

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+# PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement.
+
+# Run the compiler interactively:
+prql compile
+
+# Compile a .prql file standard output:
+prqlc compile file.prql
+
+# Compile a .prql file to a .sql file:
+prqlc compile source.prql target.sql
+
+# Compile a query:
+echo "from employees | filter has_dog | select salary" | prqlc compile
+
+# Watch a directory and compile on file modification
+prqlc watch path/to/directory