Add simple install script to avoid cmake&deps

simple_install.sh

@@ -0,0 +1,31 @@
+#! /bin/sh -e
+
+[ -f CODE_OF_CONDUCT.md ] || { echo "Please run $0 in root directory of stdexec"; exit 1; }
+[ -d "$1" ] || { echo "First argument should be a directory"; exit 1; }
+
+# exclude asio sub directory
+find include/exec -path "include/exec/asio" -prune -o -type f -exec install -D -m 0644 {} "$1"/{} \;
+find include/stdexec -type f -exec install -D -m 0644 {} "$1"/{} \;
+
+cat << EOF > "$1"/include/stdexec_version_config.hpp
+/*
+ * Copyright (c) 2021, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#define STDEXEC_VERSION_MAJOR 0
+#define STDEXEC_VERSION_MINOR 11
+#define STDEXEC_VERSION_PATCH 0
+EOF