Update README.md to provide a comprehensive overview of The Order monorepo, including repository structure, quickstart guide, development workflow, and contribution guidelines.

.gitmodules

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+# Git submodules configuration for The Order monorepo
+# Uncomment and update URLs when ready to add submodules
+#
+# [submodule "apps/portal-public"]
+#   path = apps/portal-public
+#   url = https://github.com/the-order/portal-public.git
+#
+# [submodule "apps/portal-internal"]
+#   path = apps/portal-internal
+#   url = https://github.com/the-order/portal-internal.git
+#
+# [submodule "apps/mcp-members"]
+#   path = apps/mcp-members
+#   url = https://github.com/the-order/mcp-members.git
+#
+# [submodule "apps/mcp-legal"]
+#   path = apps/mcp-legal
+#   url = https://github.com/the-order/mcp-legal.git
+#
+# [submodule "services/intake"]
+#   path = services/intake
+#   url = https://github.com/the-order/intake.git
+#
+# [submodule "services/identity"]
+#   path = services/identity
+#   url = https://github.com/the-order/identity.git
+#
+# [submodule "services/finance"]
+#   path = services/finance
+#   url = https://github.com/the-order/finance.git
+#
+# [submodule "services/dataroom"]
+#   path = services/dataroom
+#   url = https://github.com/the-order/dataroom.git
+#
+# [submodule "services/omnis-brand"]
+#   path = services/omnis-brand
+#   url = https://github.com/the-order/omnis-brand.git
+#
+# [submodule "services/arromis-brand"]
+#   path = services/arromis-brand
+#   url = https://github.com/the-order/arromis-brand.git
+