feat: add initial project structure with spam detection tool and supporting libraries

Add the complete source tree for the isspam spam detection utility, including the main C implementation (isspam.c), custom memory allocator (rmalloc.h), string builder (rstr.h), dynamic string list (rstring_list.h), build configuration (Makefile, .clang-format), CI workflow (.gitea/workflows/build.yaml), and sample test data (spam/examole_spam3.txt, not_spam/correct1.txt). The core logic defines a list of forbidden words and provides functions for tokenizing input, removing preserved characters, and checking content against the spam keyword set.

Makefile

@@ -0,0 +1,26 @@
+CC = gcc 
+CFLAGS = -Wall -Werror -Wextra -Ofast -std=c2x
+
+all: build run
+
+build:
+	@# removed -pedantic flag because it doesn't accept ' for formatting numbers 
+	@# using printf
+	@$(CC) $(CFLAGS) isspam.c -o isspam
+
+run: run_spam wl run_not_spam
+	
+format:
+	clang-format *.c *.h -i
+
+wl:
+	@echo ""
+
+run_spam:
+	@./isspam ./spam/*.txt
+
+run_not_spam:
+	@./isspam ./not_spam/*.txt
+
+valgrind: build 
+	valgrind ./isspam ./spam/*.txt