Add `one-variable-calculus` project.

one-variable-calculus/Apostol.lean

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+def hello := "world"

one-variable-calculus/lake-manifest.json

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+{"version": 4,
+ "packagesDir": "lake-packages",
+ "packages":
+ [{"git":
+   {"url": "https://github.com/leanprover-community/mathlib4.git",
+    "subDir?": null,
+    "rev": "0107c50abf149a48b5b9ad08a0b2a2093bcb567a",
+    "name": "mathlib",
+    "inputRev?": "0107c50abf149a48b5b9ad08a0b2a2093bcb567a"}},
+  {"git":
+   {"url": "https://github.com/gebner/quote4",
+    "subDir?": null,
+    "rev": "7ae096b232087096ff0243a2b70d32720d2621ae",
+    "name": "Qq",
+    "inputRev?": "master"}},
+  {"git":
+   {"url": "https://github.com/JLimperg/aesop",
+    "subDir?": null,
+    "rev": "071464ac36e339afb7a87640aa1f8121f707a59a",
+    "name": "aesop",
+    "inputRev?": "master"}},
+  {"git":
+   {"url": "https://github.com/leanprover/std4",
+    "subDir?": null,
+    "rev": "5507f9d8409f93b984ce04eccf4914d534e6fca2",
+    "name": "std",
+    "inputRev?": "main"}},
+  {"path": {"name": "Common", "dir": "./../common"}}]}

one-variable-calculus/lakefile.lean

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+import Lake
+open Lake DSL
+
+package «one-variable-calculus»
+
+require Common from "../common"
+require mathlib from git
+  "https://github.com/leanprover-community/mathlib4.git" @
+    "0107c50abf149a48b5b9ad08a0b2a2093bcb567a"
+
+@[default_target]
+lean_lib «apostol»

one-variable-calculus/lean-toolchain

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+leanprover/lean4:nightly-2023-04-02