[ADD/WIP] Add some HTTP request code

We can now *register* users!

src/Routes/Transactions.c

@@ -0,0 +1,52 @@
+#include <Routes.h>
+
+#include <Cytoplasm/Log.h>
+
+#include <Matrix.h>
+#include <AS.h>
+
+RouteHead(RouteTxns, arr, argp)
+{
+    ParseeHttpArg *args = argp;
+    HashMap *request = NULL;
+    HashMap *response = NULL;
+    Array *events;
+    size_t i;
+    
+    Log(LOG_INFO, "Caught one!");
+    response = ASVerifyRequest(args);
+    if (response)
+    {
+        Log(LOG_INFO, ":(");
+        goto end;
+    }
+    if (HttpRequestMethodGet(args->ctx) != HTTP_PUT)
+    {
+        HttpResponseStatus(args->ctx, HTTP_METHOD_NOT_ALLOWED);
+        response = MatrixCreateError(
+            "M_UNRECOGNIZED",
+            "Path /transactions only accepts PUT as a valid method."
+        );
+        goto end;
+    }
+
+    Log(LOG_INFO, "Caught a decent one!");
+    RequestJSON();
+
+    /* TODO: Do a thing with these. */
+    events = JsonValueAsArray(HashMapGet(request, "events"));
+    for (i = 0; i < ArraySize(events); i++)
+    {
+        HashMap *event = JsonValueAsObject(ArrayGet(events, i));
+        Log(LOG_INFO, "Event by '%s', with type '%s'",
+            JsonValueAsString(HashMapGet(event, "sender")),
+            JsonValueAsString(HashMapGet(event, "type"))
+        );
+    }
+    
+    Log(LOG_INFO, "OK!");
+    response = HashMapCreate();
+end:
+    JsonFree(request);
+    return response;
+}