Add README.md

README.md

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+# epgsql_pool
+
+## Usage
+
+### In a supervisor tree
+
+```erlang
+Args = [{name, {local, pool1}},
+        {size, 10},
+        {max_overflow, 10},
+        {hostname, "127.0.0.1"},
+        {database, "db1"},
+        {username, "db1"},
+        {password, "abc123"}],
+Pool = epgsql_pool:child_spec(pool1, Args),
+{ok, {{one_for_one, 10, 10}, [Pool]}}.
+```