fix braces after labels, add readme

readme.txt

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+
+8608
+
+How to use the assembler:
+1. Install bllua3 from https://notabug.org/redo/bllua3
+2. Clone this repo into the Blockland folder
+3. In BL console,
+    luaexec("your_path/assembler-8608.lua");
+4. To assemble a program, place a 1x1f ghost brick on the top-left corner of the ROM, face forward, and in BL console do
+    AssembleFile("other_path/filename.asm", "RomX RomY RomZ"); where RomX is the width of the ROM, RomY is the depth front to back, and RomZ is the height in bits.
+You can also run the assembler from the command line to get a memory dump and disassembly in stdout, if you have lua installed:
+	luajit "your_path/assembler-8608.lua" "other_path/filename.asm"