Add basic Bazel support

.bazelrc

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+build:gcc11 --cxxopt=-std=c++20
+build:gcc11 --cxxopt=-Wall

.bazelversion

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+7.1.1

BUILD.bazel

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+cc_library(
+    name = "pistache_lib",
+    srcs = glob(["src/**/*.cc"]),
+    hdrs = glob(["include/pistache/**/*.h"]) + [
+        "subprojects/hinnant-date/include/date/date.h",
+    ],
+    includes = [
+        "include",
+        "subprojects/hinnant-date/include",
+    ],
+    visibility = ["//visibility:public"],
+)

MODULE.bazel

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+# SPDX-FileCopyrightText: 2024 Julian Amann
+#
+# SPDX-License-Identifier: Apache-2.0
+
+module(
+    name = "pistache",
+    compatibility_level = 1,
+)

WORKSPACE.bazel

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+# SPDX-FileCopyrightText: 2024 Julian Amann
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# WORKSPACE marker file needed by Bazel