Initial commit w/ overall structure and minimal proof-of-concept

.gitignore

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+build/

.gitmodules

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+[submodule "libsodium"]
+	path = libsodium
+	url = https://github.com/jedisct1/libsodium.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.11)
+
+project("sodium")
+
+add_library(${PROJECT_NAME}
+    libsodium/src/libsodium/sodium/codecs.c
+    libsodium/src/libsodium/sodium/core.c
+    libsodium/src/libsodium/sodium/runtime.c
+    libsodium/src/libsodium/sodium/utils.c
+    libsodium/src/libsodium/sodium/version.c
+)
+
+target_include_directories(${PROJECT_NAME}
+    PUBLIC
+        libsodium/src/libsodium/include
+    PRIVATE
+        libsodium/src/libsodium/include/sodium
+)
+
+set(VERSION 1.0.17)
+set(SODIUM_LIBRARY_VERSION_MAJOR 10)
+set(SODIUM_LIBRARY_VERSION_MINOR 2)
+
+configure_file(
+    libsodium/src/libsodium/include/sodium/version.h.in
+    ${CMAKE_CURRENT_SOURCE_DIR}/libsodium/src/libsodium/include/sodium/version.h
+)