chore: migrate new_module script (#96)

Closes https://github.com/coder/internal/issues/611

This scripts creates a new sample moduledir with required files
Run it like : ./scripts/new_module.sh my-namespace/my-module

scripts/new_module.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+# This scripts creates a new sample moduledir with required files
+# Run it like : ./scripts/new_module.sh my-namespace/my-module
+
+MODULE_ARG=$1
+
+# Check if they are in the root directory
+if [ ! -d "registry" ]; then
+  echo "Please run this script from the root directory of the repository"
+  echo "Usage: ./scripts/new_module.sh <namespace>/<module_name>"
+  exit 1
+fi
+
+# check if module name is in the format <namespace>/<module_name>
+if ! [[ "$MODULE_ARG" =~ ^[a-z0-9_-]+/[a-z0-9_-]+$ ]]; then
+  echo "Module name must be in the format <namespace>/<module_name>"
+  echo "Usage: ./scripts/new_module.sh <namespace>/<module_name>"
+  exit 1
+fi
+
+# Extract the namespace and module name
+NAMESPACE=$(echo "$MODULE_ARG" | cut -d'/' -f1)
+MODULE_NAME=$(echo "$MODULE_ARG" | cut -d'/' -f2)
+
+# Check if the module already exists
+if [ -d "registry/$NAMESPACE/modules/$MODULE_NAME" ]; then
+  echo "Module at registry/$NAMESPACE/modules/$MODULE_NAME already exists"
+  echo "Please choose a different name"
+  exit 1
+fi
+mkdir -p "registry/${NAMESPACE}/modules/${MODULE_NAME}"
+
+# Copy required files from the example module
+cp -r examples/modules/* "registry/${NAMESPACE}/modules/${MODULE_NAME}/"
+
+# Change to module directory
+cd "registry/${NAMESPACE}/modules/${MODULE_NAME}"
+
+# Detect OS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  # macOS
+  sed -i '' "s/MODULE_NAME/${MODULE_NAME}/g" main.tf
+  sed -i '' "s/MODULE_NAME/${MODULE_NAME}/g" README.md
+else
+  # Linux
+  sed -i "s/MODULE_NAME/${MODULE_NAME}/g" main.tf
+  sed -i "s/MODULE_NAME/${MODULE_NAME}/g" README.md
+fi
+
+# Make run.sh executable
+chmod +x run.sh