gitignore and user/group config

- Add gitignore for generated files and executable
- Add user and group to config.h

.gitignore

@@ -0,0 +1,3 @@
+.vscode/
+*.o
+slock

config.h

@@ -0,0 +1,12 @@
+/* user and group to drop privileges to */
+static const char *user  = "sravan";
+static const char *group = "sravan";
+
+static const char *colorname[NUMCOLS] = {
+	[INIT] =   "black",     /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* treat a cleared input like a wrong password (color) */
+static const int failonclear = 1;