Adds nightly GHA workflow to test build; Add README.md (#55)

Author: jwaldrop107

.github/workflows/nightly.yaml

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+# Copyright 2025 NWChemEx-Project
+#
+# 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.
+#
+
+name: Nightly Workflow
+
+on:
+  schedule:
+    - cron: "0 6 * * *" # Every day at 06:00 UTC (00:00 CST)
+
+jobs:
+  test_library:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
+    with:
+      compilers: '["gcc-14", "clang-18"]'
+
+  integration_tests:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
+    with:
+      compilers: '["gcc-14", "clang-18"]'
+      repo_toolchain: '.github/integration_testing.cmake'
+
+  # tamm_tests:
+  #   uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
+  #   with:
+  #     compilers: '["gcc-14"]'
+  #     repo_toolchain: '.github/tamm_testing.cmake'

README.md

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+<!--
+  ~ Copyright 2025 NWChemEx-Project
+  ~
+  ~ 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.
+-->
+
+# SCF
+
+[![Nightly Workflow](https://github.com/NWChemEx/SCF/actions/workflows/nightly.yaml/badge.svg)](https://github.com/NWChemEx/SCF/actions/workflows/nightly.yaml)