Initial implementation of logging library

Signed-off-by: Aidan Hahn <aidan@aidanis.online>

README.md

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+# Introduction
+- *alog* or *a logger* is a lightweight, portable logger written in C.
+- It is entirely unremarkable
+- Usage of *alog* is extremely simple. [See the API](alog.h)
+
+# How to build
+```bash
+$ make so
+```
+
+# Variables
+The following (shell) variables can be set to influence behavior at runtime:
+
+- **ALOG_DEBUG**: Set this variable to compile with debug symbols
+- **ALOG_HIJACK_PRINTF**: Set this variable to compile along with a printf implementation that leverages alog. Probably dont though.