Add merging build script & update README

.gitignore

@@ -0,0 +1 @@
+Build/

BuildMerge.py

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+import subprocess
+import platform
+import sys
+import os
+import time
+import shutil
+import zipfile
+
+root = os.path.abspath(sys.path[0])
+builds = os.path.join(root, "Build")
+combined = os.path.join(builds, "Combined")
+outputjar = "CustomWindowTitle.jar"
+
+gradlew = "gradlew.bat" if platform.system() == "Windows" else "gradlew"
+
+def build(folder):
+    separator = "========={}".format("=" * len(folder))
+    
+    print(separator)
+    print("Building {}".format(folder))
+    print(separator)
+    
+    libs = os.path.join(root, folder, "build", "libs")
+    shutil.rmtree(libs)
+    
+    os.chdir(os.path.join(root, folder))
+    subprocess.run([gradlew, "build"])
+    
+    for fname in os.listdir(libs):
+        if "-dev" not in fname:
+            global outputjar
+            outputjar = fname
+            
+            jar = os.path.join(builds, "{}.{}".format(folder, fname))
+            shutil.copyfile(os.path.join(libs, fname), jar)
+            
+            jar = zipfile.ZipFile(jar)
+            jar.extractall(combined)
+            jar.close()
+            
+            break
+
+if os.path.isdir(builds):
+    shutil.rmtree(builds)
+    time.sleep(0.25)
+
+os.mkdir(builds)
+os.mkdir(combined)
+
+# Forge must run last to overwrite MANIFEST.MF
+build("Fabric")
+build("Forge")
+
+os.chdir(builds)
+
+with zipfile.ZipFile(outputjar, "w", compression = zipfile.ZIP_DEFLATED, compresslevel = 9) as jar:
+    for root, dirs, files in os.walk(combined):
+        for fname in files:
+            fname = os.path.join(root, fname)
+            fname = os.path.normpath(fname)
+            jar.write(fname, os.path.relpath(fname, combined))

README.md

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-# Minecraft-Window-Title
+# For Users
-Minecraft mod that lets you customize window title.
+
+## Installation
+
+The mod supports [Forge](https://files.minecraftforge.net/) and [Fabric](https://fabricmc.net/) (*) mod loaders, **the same mod file will work in both**. Follow either mod loader's installation guide, then [download the mod file](https://www.curseforge.com/minecraft/mc-mods/custom-window-title/files) for your Minecraft version, and install it into the **.minecraft/mods** folder.
+
+(*) Fabric API is not required.
+
+## Configuration
+
+Run the game once to create the configuration file. By default, the window title will be set to **Minecraft _<version>_**. Unlike in vanilla 1.15.2 onwards, the title will not change when you enter a world/server.
+
+To change the title, navigate to the **.minecraft/config** folder, and open **customwindowtitle-client.toml** in a text editor. You will see the following line:
+
+```toml
+title = "Minecraft {mcversion}"
+```
+
+Change only text inside the quotes. You can use the following special tokens:
+
+* **{mcversion}** - current Minecraft version
+* **{modversion:<span style="text-decoration: underline;">modid</span>}** - version of installed mod with the identifier _modid_
+
+If any of the tokens aren't working, search the game log for **CustomWindowTitle** and you should see the reason, otherwise please file an issue on the [issue tracker](https://github.com/chylex/Minecraft-Window-Title/issues) with as many details as possible.
+
+## Screenshots
+
+These screenshots were taken using the following example configuration:
+
+```toml
+title = "Minecraft {mcversion} - Custom Window Title {modversion:customwindowtitle}"
+```
+
+![](https://media.forgecdn.net/attachments/277/212/customwindowtitlefabric.png)![](https://media.forgecdn.net/attachments/277/213/customwindowtitleforge.png)
+
+# For Developers
+
+Currently the common source files (package `chylex.customwindowtitle`) are just duplicated in the Forge and Fabric folders, and the jar files are combined with a horrible python script. If anyone has the time and patience to clean it up, I'd appreciate a Pull Request :P
+
+For now, you can build either separate Forge and Fabric projects using `gradlew build` in either folder, or run `python BuildMerge.py` to automatically build both and combine them into a single `.jar` file.