refactor: rename file in number/float32/base/add

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Author: gururaj1512

lib/node_modules/@stdlib/number/float32/base/add/manifest.json

@@ -28,7 +28,7 @@
     {
       "task": "build",
       "src": [
-        "./src/add.c"
+        "./src/main.c"
       ],
       "include": [
         "./include"
@@ -42,7 +42,7 @@
     {
       "task": "benchmark",
       "src": [
-        "./src/add.c"
+        "./src/main.c"
       ],
       "include": [
         "./include"
@@ -54,7 +54,7 @@
     {
       "task": "examples",
       "src": [
-        "./src/add.c"
+        "./src/main.c"
       ],
       "include": [
         "./include"