feat(landerctl): started custom cli tool; wrote config parser

landerctl/include/landerctl.h

@@ -0,0 +1,23 @@
+#ifndef LANDERCTL
+#define LANDERCTL
+
+typedef struct landerctl_cfg {
+  const char *api_key;
+} landerctl_cfg;
+
+typedef enum landerctl_cfg_err {
+  landerctl_cfg_err_ok = 0,
+  landerctl_cfg_err_not_found,
+  landerctl_cfg_err_invalid,
+  landerctl_cfg_err_incomplete,
+} landerctl_cfg_err;
+
+/**
+ * Try to parse the required config arguments from the config file
+ *
+ * @param out config to write values to. Existing values are overwritten
+ * @param path path to config file
+ */
+landerctl_cfg_err landerctl_cfg_parse(landerctl_cfg *out, const char *path);
+
+#endif